Thanks for raising the concern! We'd love to have that too at some point.
Ditto. Also I'm a big Notion fan but there is no way certain stuff I work on can be on it, or I can recommend it to many people doing sensitive things. Which is a pity. Notions security is its biggest flaw. Also the lack of proper two factor in the modern age is silly.
I'm curious. Why the need for E2E?
I tend to use these platforms to organize my personal life and thoughts. Sharing that information in any way with a for-profit company is a non-starter for me. "Trust us, we care about your privacy" isn't good enough for me.
I would recommend looking at Standard Notes. It's paid only but it's so worth it.