With notes, if I ever have the need, I just use plain text / markdown files in a shared folder (I went back to the Dropbox free plan but there are plenty of alternatives). I don't have a habit of note taking though so I never had any attachment to any particular app for that.

I just wish the file sharing things didn't feel so entrenched. I think it's only a matter of time before Dropbox becomes unavailable or no longer offers a free plan (plus it's already restricted to 2 or 3 devices). Using Apple's thing feels unnatural on my Windows PC, using Microsoft's feels unnatural on my Apple devices, using Google's feels like it would require a separate app on every device and you'd still end up in the (imo unnatural feeling) web interface a lot.