AbdulAlhazred
Legend
In Heroes of Myth & Legend 'level' is less associated with experience and is more representative of connection with fate and how their destiny is impacting the world. XP and such is not really a thing, though characters do advance.I agree with your general thesis that a D&D style party generally works better with characters who are "experienced" than with a bunch of farm kids on their first journey outside the village.
The complication, of course, is that the core mechanical conceits of D&D are based around starting with very few abilities and quickly rising to have a lot of abilities.
I have noticed, though, that my games that have been most successful story-wise have been those where the characters started at higher levels (anywhere between 5th-10th) and only gained a few levels throughout the campaign.