I´ll be fine if it´s just one level, level 11 to get some necessary improvements for some classes and 6th level spells for casters.
With only a level cap of one level more, 11 you can have the warlocks´ mystic arcanum, artificer´s spell-storing item, fighter´s third extra attack, rangers´ and monks archetype feature and rogue´s reliable talent...
I am completely fine with the level cap at 10. By having such a low cap, more time can be spent on good plot, story writing, and coding, and less time trying to fix martial/caster disparity or bugs.
Pathfinder Kingmaker has way more spells, races, than this game will gonna have and ... LV cap = 20. Wrath of the Righteous will bring epic options, including lichdoom path, path to become a golden dragon and so on.
This!
I will add NWN2 or PoE2, etc to that list too.
You may like it the dialogues, plot, characters, etc in those games or not; , but in sheer numbers you can make a good amount of plot and story writing and class and combat content in the same game. The guys that write the script and dub the games are not the same that tests the combat and classes to be balanced.
...And they have the base combat, class and race mechanics, character creation already made---> D&D5e
