Level 10 is a decent cut-off point, considering the power spike at 11th level and 5E being at its best in the 4-12 range or so IMO.
It will affect some classes much more than others, so fans of some classes might be disappointed (at least in combat). It's bad news for Bards, Sorcerers, and Druids, while Warlocks (especially with the lack of short rests), Clerics, Rangers, Barbarians, and Monks should be happy. However, if they add the Hexblade, all munchkins will be playing the same build anyway and won't even care.
A majority of classes in 5e get their final college, path, archetype etc between 13-15. If it's hard cap at 10 then some class-paths will be less interesting. I understand a lot of people like lower-level DnD (me included!) but I wouldn't equate 5e's mid-level gameplay to previous systems, 5e being overall more balanced and less epic. If BG3s scope is as big as one could assume, then I'd personally like to see a level 15 cap to get a more accomplished experience with all classes. Good low-level gameplay would still be present and one thing doesn't need to exclude the other, so to speak.
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