This new expansion is actually the proverbial tits. I normally don't buy things full price, and don't think I've ever done so on Steam, but damn, I actually think it may have been worth it. There are just so many minor little unfixable things where you needed to play in a gamey and fiddly way to get around, that are now given proper player options.
There was always this fear in the back of my mind that every time I declare war on some random insignificant target their alliances would travel up the chain and somehow always lead to France joining in. Or wanting to bring my allies into the fight, but also having to race them to the provinces I want and just wait for them to occupy the provinces I want them to get. Also or, having to fabricate some CB to be able to force some country into returning cores to a vassal. Also also or, starting wars where you want the same CB to apply to the target and one or more of their allies, rather than eating the dip points.
I also think it may be possible to get around all the vassal feeding restrictions with the change occupation feature, by having the peace cede the provinces to them directly rather than having to sell them. It's seemed to work so far, but I have seen some weirdness where I still end up getting the province when the peace said a vassal would get it, so maybe they anticipated that.
One kind of annoying thing though is that it seems occupying all of the war leader's provinces no longer gives 100% warscore, which is only really a problem when you're annexing a OPM war leader and they have sprawling blob allies. It seems to work fine in circumstances where the target is larger though, since you'll be able to get a higher local warscore.