Obryn
Hero
There's a few big benefits, starting with simplicity. Even for experienced players, it's helpful to package all your stuff together. Choices are important, but the critical information about a PC should imo be their class, so you can say "paladin" and have a good idea what that means.What purpose(s) do you see D&D's strong archetypes serving? I also have a sense that there is value there, but it's tricky teasing out exactly what that value is, so I'd like to hear your view. It makes things easier for new players, of course, but for experienced players what do you feel is the benefit?
A secondary, mechanical benefit is the removal of weird synergies, allowing you to put interesting stuff into a class at multiple levels while not worrying about how they all interact.
I think there's less definable benefits, like hooking your imagination into archetypes and keeping a good game mechanical shorthand to talk about characters, but yes, those are hard to define being all full of "feels."