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Gog is not Steam. Gog will never have access to the Steam Workshop.
They are two different, competing stores.

I don't really care about that. There are plenty of other games that have in-game or in-launcher mod managers and don't rely on the Steam Workshop. Factorio and Rimworld are two examples. Those games were written by small, independent studios. If they can figure it out, then surely Paradox can.
 
I'm no mod author, but I do see the advantage to create with Steam Workshop. But as a GoG customer, it sucks.
I don't mind manually handling mods, have done it with Skyrim since day 1.

Why can't Paradox make a ingame "workshop" that lets you log on to Steam Workshop with your Paradox account, from within the game? Using the Overlay from Gog Galaxy client?
I bet Steam will do everything in their power to "force" every gamer that loves modding, to use Steam platform...

Or Paradox could take a stand... prevent modding on Steam Workshop, only use Paradox Modding, get some cash-back to the authors and let the community flourish.
This is just sad. They advertised the game "with Mod-support" and didn't mention it was Steam only that has mod support.

Other platforms will always get stuck in the shadow of Steam... No real and fare competition.
 
One is in the works
https://mods.paradoxplaza.com/
If and when it will ever cover SuMa I cannot say, but there's hope!

Yeah, it's been "In the works" since launch, but neither Paradox nor Haemimont ever responds to questions about it and they've never written anything about it. The game just says that mods aren't yet supported in this version. Well, obviously.

I'm quite disappointed in the lack of mod support for non-Steam players who paid the same price as their Steam counterparts and aren't getting the complete game experience.