I don't think the best path towards interoperability is to run after those who based their entire business model on making interoperability a problem in the first place.

If I were to create an office suite that cares for interoperability, it would be based on markdown and CSS, viewable in the terminal, one could `grep` and `sed` and `git diff` through it, LLMs could read and write it natively, ... But I'm afraid it'll take another 40 years until we're there.