Offline mode. Notion have so far went down twice, longer than 8h. Loosing ALL your notes and knowledge bits with 0 backup plan, all in the mercy of a small company was the first true moment I realized how much "put stuff in the cloud" was a stupid idea unless it's on a too big to fail platform (Google/Apple)
Bugs my mind why their reactions to above often complained features have been "meh". All I can deduce is that their business model relies on keeping it online / central and how the tech is set up, it's not trivial to do it offline