Now to be fair I would hardly say this is just SotS 1 with a facelift. The mission system and new fleet system has added in a tactical aspect that wasn't there in SotS 1, no longer can you spam fleets, you have to make strategic choices. Stations now play a far more bigger role in SotS 2 than SotS 1, unlike in SotS 1 where you could not build a station at all and still dominate, here stations form a key in any strategy, modules add in an interesting touch.
Regarding Admiral traits, while they may seem superfluous and useless a good Admiral does help, and the new techs such as personality Engrams which allow you to keep Admirals traits in a sort of VI.
Also, the devs stated from the very beginning that SotS 2 was meant to represent the "Age of Empires" in the SotS universe, that is that SotS 2 was to focus on the more deeper diplomatic and Empire building options, which it does. No great technological revolution took place so I think that's why we see a natural progression of technological advancement rather than a whole host of new techs. It's simply lore progression.