I think I struggle to see any application of LLMs for my notes that wouldn't, in practice, be just as easily implemented as a search facility.
My main challenge with my notes (that I've been collecting for about 15 years) is remembering to consult them before I google.
I suppose a unified interface to both my notes via LLM and internet search would help, but then I get that with my Apple Notes and the Mac's systemwide search, if I remember to use it.