I often fall back to Apple Notes (I know not really a knowledge base, or markdown) because it syncs between my devices and it's usable on the phone. Is this something you have a need for yourself, or how are you looking at your notes on mobile?

I solve it by using Apple Notes for quick capture and then copy pasting from my mac to obsidian daily/specific notes, that I want to keep.

I also just keep long running notes for tracking things workouts and meals with headers for dates.

Works better than things like obsidian mobile and copy pasting is a natural filter.