Well, Obsidian, Notion, Anytype, Affine can give you a hint of possible directions in this transition. While they still retain document-oriented features, like the concept of Page, they also try to really go for a much richer experience that does away with the limitations inherited from paper-based solutions. Double-linking, composability, fractal properties of pages and nesting (especially in Notion and Anytype), block-based UI, seamless integration of text, databases, and embeds, heavy use of transclusion and other stuff like that.
I would say this alternative system is far from cohesive and mature, but it’s clear some software is emancipating itself from whatever Onlyoffice represents.
Maybe you would find this video interesting: https://www.youtube.com/watch?v=KXiQlLHuK7g
yey, more friends to chat with.