Character progression is really important to me too.
I wish we can become some kind of legendary character in some skills. However, it requires a strong skill feature that does allow progression. ANd Larian, those guys have always be very good at that, giving you a feeling of progression, and becoming very powerfull. I remember fondly divine divinity, (or beyond), when you thought character progression was over, only to discover a whole layer of new godly powers. I loved that.
And keep in mind there will be mods. Mine will be focused on skills, replayability, randomness and world interactions. And the big result will be to gain a feeling of character power, but not only through numbers and items powers, but also through possibilities.
And keep in mind that it is also fun for some people to keep playing, and feel the power once you are at the top.
Yeah, that is exactly how I like it. Sounds great!
Unfortunately for me though, I haven't gotten very far in Divine Divinity to feel how the character progression is yet. I can tell you though, playing Neverwinter Nights 2, particularly the Baldur's Gate Reloaded mod, I really dislike the character progression. It is way way way too slow and each level up feels very minute and unimportant. My favourite progression feel in out of any game is definitely from Diablo 2 and the Elder Scrolls Series (particularly Morrowind). Those games had consistent and very effectual character progression that I adore.