AOT is a little fussy in real-world usage particularly for things like reflection. You can probably force it to work but it may make your code much uglier.
Span<T> is more important for performance TBH JIT warmup isn't a huge issue for a long-running process
AI agents seem fairly good at generating source generators so there doesn't seem to be a reason to not use them.
With UnsafeAccessor you can often avoid reflection.
What's fussy about AOT and reflection?
Only a subset of reflection is actually AoT safe, and you can run into issues like "the method you wanted to call wasn't statically referenced anywhere, so there is no compiled implementation of it".