Okay finished up my first 1.30 playthrough. Lots of thoughts on the new Governing Capacity mechanic, which as a whole I like (along with the patch in totality:
really like the direction that Paradox went with this patch with the renewed emphasis on missions supplementing national ideas/traditions, the big changes to revolutionary governments so that "Spread the Revolution" is only mildly absurdly overpowered, buffs to republics, etc.)
I understand (and appreciate!) the fact that you can spam courthouses in TCs to negate governing capacity penalties, but that just means that the optimal endgame meta is spamming courthouses everywhere, which is incredibly tedious particularly when the AI makes consistently horrible building choices (they never build furnaces, always build churches, always build , etc. etc.). Granted, the GC mechanic is uniquely highlighted when you play as Prussia due to its steep GC penalties, but I'm fairly certain you can still state just about all of the Western Europe superregion w/ Prussia (every non-TC). So it just needs to be easier to do it, then.
Now that Courthouses have gone from being the worst building in the game to the most important, I would love to see them make them a free building slot like Universities. I understand the balance concerns (and it is nice to have to make difficult choices when constructing buildings) but micromanaging is by far the least fun part of EU4.
Paradox already made the choice to let players min-max the system and do something historically impossible: conquer the world. Therefore, the costs (in money) should be balance enough -- not unlike previous patches with steep corruption penalties. The penalty shouldn't be: player, do a bunch of horrible micromanaging in the game's least fun component. Plus, TC investments exist (in their own awful UI), universities exist, etc. so it's not like Paradox hasn't done something like this before.
That, or let us spend admin points to boost GC or something. Any time you can't convert one of the game's many currencies into another, you intuitively know the game is intentionally bottlenecking you. And half the fun of Paradox games is figuring out how to circumvent the game's many soft bottlenecks (no money, no monarch points, coalitions, etc.) and get ahead of the curve.