Yup, Notion and OneNote occupy similar scenarios for me. It's where I can gather my compiled thoughts and notes, but I've had trouble implementing any team processes on it due to it not being constrained enough in its UI.
I don't think there's any easy answer here. I respect the Notion team a lot for making a tool that is so flexible, but it's also a curse in some key scenarios.
Onenote is so close as a perfect system for me but what it leaves out really hurts.
-No task Hierarchy
-No alerts for due dates (Yes you can add outlook tasks but its flakey)
-No automatic reporting
Yeah. I see that it works great for some scenarios, like when I and my co-founder are collaborating. But if I try to teach it to a sales guy, I can see he just hates it :(
I don't think there's any easy answer here. I respect the Notion team a lot for making a tool that is so flexible, but it's also a curse in some key scenarios.