@bitmode Which mods would you recommend ?
The ones you have lying around locally to fix the stuff that annoys you most

I don't have any insider tips really; Expert AI and Player Led Peace Conferences are obviously pretty great. Hearts of Oak too, if you're playing with historical AI focus on. Maintaining public bug fix mods like Vanilla+ used to is really hard because their tight integration with the vanilla game breaks with every patch. And while there are far too few, it is hard to pass on the bug fixes in a new official patch to stick with bug fixes of an outdated mod.
My old sig had a couple quotes to the nature of "Paradox gamers are funny. They take games that take dozens of hours to get into, and then play them for hundreds of hours, and then come back to the forums to decry them as 'unplayable with no replayability value' without a trace of irony". Never change, indeed.
It's like one of those long-running TV shows you keep watching because you were invested in them even though you don't enjoy them anymore. (Apologies to the people who like the later seasons of Game of Thrones, Big Bang Theory, etc.).
The deal-breaker for me was that they finally fixed Vichy France insta-joining the war
I think this ties into the point you made before about calling the game "unplayable". In
@podcat's mind, Vichy France was not "broken" before, hence LaR is not strictly pay walling the "fix". You could play as Vichy before and they were working as designed at the time. The "improvements" made in the DLC just so
happen to align more closely with what most players expected to have already payed for in the base game.
The strict use of the words matches Paradox' (business) interests in the same way the lose use of the words matches OP's intent of demanding a better game. The latter could more precisely be worded like this:
this is really disappointing and worse than I thought