The problem with DnD leveling is that you stay exactly the same for very long time ... and the only thing that can effectively change your gamestyle is loot ...
That’s… not exactly my experience. Getting “longsword +1” won’t exactly shake things up the way a new level of spells becoming available or multiattack will. BG3 has of course its gimmick sets, but those are not very D&D-like.
BG3 leveling will be different than let’s say D:OS2 which was more about gaining many levels with incremental improvements, rather than fewer but bigger power spikes.