I will admit, for me a lot of the fun class/prestige class features come at lvs 15-20
I do believe will get there , but from an expansion. Both neverwinter games had expansions. I don't see why this will be different, and I'm ok with that. Hell Hordes of the Underdark is one of my all time favorite stories/quests
I mean, maybe, but I wouldn't get my hopes up. The difference is that Larian is making BG3, and they've historically not put out extra DLC content. They *might* do a sequel full game, but even that is unlikely for the reasons mentioned above. Much more likely is they go back to Divinity, some new game, or create another D&D game that starts you back at lowish level.
Sad Pathfinder 2nd edition launched later, when game development was already in progress. Would be so much better basis for game. Not mentioning action-points-based mechanics, which which Larian much more familiar.
One the one hand, yes the action system and balance of PF2e would be better for Larian. There's even natural in-game ways to get extra and reduce your opponent's actions, something Larian has homebrewed into BG3. On the other hand, PF2e has MUCH tighter math than 5e, and Larian's desire to homebrew things would seriously mess with that.
Larian also almost certainly wouldn't have chosen that system. They likely went for D&D5e/BG3 because of the brand-name recognition, which pathfinder certainly doesn't have. And if they somehow had chosen a pathfinder game, the revenue and thus budget and thus scope would have likely been much smaller...