The game is too easy but it's mostly cause Larian abandoned all type of balance by changing feats, creating ridiculously strong items, environmental effects, and so on. Even changing action economy by giving more bonus actions.
I mean, it's almost like they kind of attempted to be D&D faithful, and then mid-way they like "ahh let's just try to do it our way".
If all the abilities/subclasses/feats/etc worked like a D&D game, tactical would be a great difficulty.
But yes, with all the broken shit there is right now, like tavern brawler, thief bonus action, bugs with throwing and rage stacking/height jumping etc... the game is too easy.
To me it would just be easier to nerf a bunch of stuff - but I don't know if they will do that.
I disagree. Nerfing stuff is one way to handle it, but allowing you to choose 16 Point Buy would at the very least make the game harder and probably harder than the majority of players would even want on Tactician (and if it's still too easy, try 12 Point Buy). And it would be very easy to implement as an option. Nerfing stuff takes a lot more effort.
I'm not saying your concerns are unmerited. I don't think it is fun to ignore abilities just to make the game harder, like only using Thief Bonus Actions to Hide, Dash, or Disengage when the game allows you to use them for other things but I think you have to make suggestions that are going to be relatively easy for Larian to implement and that other players will not complain about because they can be made optional. (I know people complain about options online, but it's in the vein of badwrongfun, which should always be ignored.) Anyone who already took Tavern Brawler is going to be pretty annoyed if it doesn't deliver what was promised due to a nerf; I just don't see that happening. Plus, mechanical suggestions are not nearly as popular as fluff, but the fluff suggestions take a lot of work, so if there was a groundswell of support for a mechanical suggestion to make the game harder with relatively little work, Larian would probably do it.