I do try to strike a balance between flexibility and ease of use. I think Notion is too complicated (yet very flexible/powerful). With Plume, the focus is to be able to organize your thoughts in a powerful way, effortlessly. Sign up to the waitlist and try it once it’s out. Much more is coming soon.
I wrote about the problem space extensively on this site before, tl;dr, to me the issue lies in the fact that most of the contenders aim to manage data/knowledge/notes as "types" (for categorization, templating and derivation/re-purposing), but, to my knowledge, only trilium is enabling that with a "sound" design. Notion is exposing a lot of incidental complexity due to its "unsoundness".
Good luck with your project!
(if there's a better place to have this conversation than (ab)using this thread feel free to point the way. Assuming you wish to indulge me at all that is. ;-)