It's currently essentially not possible to use trade as a more useful thing to your economy, than to just develop domestic consumption (maybe outside opium to Qing)
Your assertion is false though, but thats also because you likely never put much efoort in developing strategies that make trade work for you.
You can take a country like Venezuela, use their potential to build some plantations, get cheap cash crops, and export them around the globe, but wait:
- you don't have the interests to do so, best invest in a navy
- also you need to provide convoys and ports
- also pay bureaucracy
- actually we can't really export with the tariffs on it
- great, btw the owners don't actually pay any taxes on dividends
And you think the trade rework is going to solve much of that particular issue?
Venezuela does not have the competitive advantage in terms of labor cost, no'r will it want it. For the relative few demand for plantation goods that exist early on the likes of portugal can market them to European powers at far cheaper rates trough colonial exploitation so they just win out, and as the game goes on more colonies will bring in more cheap plantation goods likely at tprices to which Latin American coutnry's can't and dont want to compete.
Sure, its true that you are unjustly punished for wanting to play a trading nation now, arguably, for having to pay for transport and bureaucracy, and i think this is a critique we all get and agree upon and which we will happily see changed trough the trade rework. But the idea that latin American country's will easily be agricultural power houses selling cash crops to the Europeans over the competition offered by other players over a profitable tariff? Maybe by late game when demand has significantly increased? And even then do you want your people to work those cheap goods and be some sort of banana republic as it were? Maybe for roleplaying reasons sure, but not for the purpose of optimal play, for the purpose of optimal play you aim for as high a productivity per worker you can get and thats not going to be in agriculture.
Otoh, anyone can trade goods produced in min-max fashion at rediculous cheap costs trough colonial exploitation, from farms to sweat shops making clothes to whatever. It might take a bit of effort to set it up right, but you can typically produce profitably even at -75% market price, at that point there are plenty of goods that the AI will buy even over a 30% tariff. Though otoh your pops are even more forcefull on trade for the purpose of consumption over tariffs if they are wealthy enough and left with no choice, so even the absence of a variety of industry can create a fair amount of import volume to which a high tariff can be put.
There is 2 choices typically when it concerns tariffs, either you want to promote an industry for the labor and the productivity and wages that it offers and then you dont put a tariff on them to stimulate their trade, or you can have an army of dirt cheap labourers create a ridiculous volume of utterly cheap goods for a relative low investment that generates a fair amount of income in tariffs and perhaps dividends too. Which is to say, if you want to actually earn on tariffs too in your trade then its not nessecarily about stimulating your industry anymore, its about finding trades that will work over the margins of tariffs wherever you can find them that are profitable as they are, its either trading inbalances that translate into price difference between regions of stimulating said inbalances.
Like there was an example of becoming an iron exporter as Sweden. Okay, you have good potential for it. You get yourself LKAB iron company and start exporting it. Is it that you start building a competitive advantage, which makes you sell iron for more, than its market price? Where do the profits go to? Are the trade centers getting cheap Swedish iron and sell premium Swedish iron TM, getting a price difference as pocket change? Do they then invest that money back into the economy? If you slap a small tariff on it, do you hugely crush your competitive advantage? You have a small population so maybe it's actually a total waste to build unnecessary mines, and sending your people into work in ports and trade centers, if they could just do something useful for the economy. Idk, we will see, I am somewhat optimistic, but I am not trying to set too high expectations of the system.
Its all to be seen in what perspective you want to use this.
Tariffs CAN be a way to get a lot of money fast, but may not be the fashion in getting most money in the end. If you trade your iron for the tariffs, then its for the utility that the tariffs offer you at that moment in time typically. If you trade your iron withought tariffs to stimulate their development, then its for the utility of labor and wages and such which would often be a more long term goal. One thing to understand afcourse is that there is a fair discrepancy between the productivity per person that various industry's can offer in which mining once diesel pumps arive is a pretty good sort of industry to be specialized in, in relative terms, certainly more so that farming. And there are ways in which Sweden cane easily become a mining country withought nessecarily having much other industry when it works with synergetic vassals within a common market like Egypt for example. Within the common market tariffs arnt levied afcourse, as to what excesses the common market might produce its quite something notable that it is the market leader so to speak that typically makes the money on the tariffs for the whole market.
The real crux of it is labor costs, thats it. Would you ever want your Swedes to work cheap wages for the purpose to be more competitive in trade and collect tariffs, do you want to overproduce iron in Sweden to the point the price is going low for the purpose of export, even knowing that in fact iron takes a lot of shipping to transport which is kinda fair. Withought cheap labor, your kinda always at a disadvantage for the purpose of competitiveness so to be able to sell over a tariff, lest you specifically create market inbalances that will stimulate trade to which you can perhaps even act in between.