Consider a future where Microsoft will eventually build co-pilot for office documents based on all the crap stored in office applications/onedrive.

Consider a present where lawyers just need to get their work done

Luckily both can be done without Microsoft, eh?

I think the online version of Microsoft Office is not as feature-complete as the offline one. That, and performance is surely worse on large documents.

No, thank you. I prefer emulated Windows native apps over web apps, and that's despite virtualisation and seamless app delivery being a giant pain in the ass for as long as I can remember. Web apps have worse latency and feature sets even if they didn't have a worse resource consumption.