Thanks for engaging, and my apologies if I misrepresented something you said earlier. "...functionality that bitcoin doesn’t support" is clear to me. That is part the appeal of an additional L1, that it could present the Bitcoin ecosystem with fait accompli in terms of additional functionality, and thus speed up the developmental process, time being of the essence, as  nostr:npub1m4ny6hjqzepn4rxknuq94c2gpqzr29ufkkw7ttcxyak7v43n6vvsajc2jl describes.

Is there some resource I can look at to get clear in my head the distinction between "application layer" and the rest? At the end of the day, for me, it comes down to code and functionality, I'm agnostic as to the layer or avenue through which it arrives!