A sequel is a horrible idea for increasing the level cap honestly. I can sort of understand why in BG1-2 it happened, most people didn't know what was going on. But legitimately, it's really off putting to level your character at the start of BG2.
I don't know about that, I played BG2 first - also first RPG in general. Most classes there don't have much depth to them so leveling up is straightforward. Picking spells can be intimidating, but again it doesn't really matter if you pick right or wrong - with wizard you will pretty quickly gather new spells so you can learn as you go along. Unless you picked someone like sorcerer for your first playthrough - that can end up bad.
Still, I think it is natural to create first character and scrap him after couple hours if you don't know the system. I know I had to do that with my assassin (first character). Attributes aren't really a choice in DnD and tried to spread things around a bit too much. And invest in charisma, because I liked my characters being likable to compensate for real-life-me. Little I know there was little to no benefit to it in BG2.
Overall I always recommend starting with BG2. It's a better pace game, with more variety, and 2nd edition higher levels are just more fun to play. I don't think leveling up is such a hurdle to get over, compared to character creation itself. I remember it being rather cool being offered that many spells from the get go.
EDIT: as to OP. I don't know. I didn't play the game, and most importantly I don't know what kind of story Larian is looking to tell. So far they have been doing fully contained narratives, so even if they were to continue in Forgotten Relms, would it be BG4 or NWN3 or Icewind Dale3?