Personally, I'm less concerned about spell levels and mechanics than having a story that justifies higher levels. I think of someone reaching level 20 as being the culmination of a career, after years of different adventures, so going from level 1 to 20 in one game isn't really something I want unless it is ridiculously huge and spans many years. And in gameplay terms, I don't like levelling too quickly and prefer to get the opportunity to experiment and use the abilities I get at different levels.
I'd be all for an expansion or DLC, or BG4, that could take us to higher levels, but I am very glad Larian didn't try to cram more levels into BG3. And even if we don't get those expansions, then I wouldn't want the pacing of increasing levels in BG3 to be any higher than it is now, though admittedly I'm still only at level 8 at the moment.
I feel the same way. A campaign would have to be ridiculously long, like an epic trilogy, with some significant time jumps between chapters to get you to 15+. Most D&D characters never reach anywhere near level 15 or 17 because it's getting in the legendary territory and you get powers like leveling entire cities with Meteor Swarms. How many Wizards like that can there be in a setting? How do you control them if they go insane? RPG worlds need to make sense.
A video game shouldn't be a rush to max level either. I want to experience every single level and get a feel what it means to be level 5 or level 9. So you appreciate the new levels more. Sometimes finding just one new item can be a cool upgrade. Leveling is already too fast in BG3. You go from a complete rookie into a powerful hero over just a quick trip to a wilderness, a little visit to the Underdark and some shadow cursed lands. Then you do some quick stuff in the city and bam, you're level 12. BG1 was paced better. I think the original level cap of 10 would have been enough for BG3 with slower advancement. But there is always pressure from players to have all the levels and all the powers and 100 levels and bigger numbers.
The illusion that more is always better.
