I think you are missing the point. The OP isnt promoting the idea of less difficulty or an easier game. He is saying to make the lore/situattion/immersion with the level of the party. Not in terms of difficulty. My suggestion would be that they create a story element that would explain why these seasoned adventurers are such a low level, considering they have what seems like a varied background and high level experience with magical items, and have fame for adventuring. These are clearly not Level 1 characters in any sense. Level 1 adventurers are adept at combat and know a skill or spell or two but in no way have they completed many adventures or have any sort of renown. If they have I believe they would be level 3 or 4 atleast.
No, I did not miss the OP's point(s). On the other hand, some of you have missed my point: Larian Studios (and internal testing) had indicated that the max level for BG3 would be in the neighborhood of 10-12 possibly a wee bit higher short of a modder creating a mod to bump it to say something like 18-20. To those of you advocating starting at level 10, what's the point in playing when a BG3 full release only has 3-4 Acts with a max level of 10-12?
Start at level 10.
End game at level 10-12.
What? Huh? Did I miss something here?