Windows 7 definitely beats Windows 10 from a privacy, simplicity, and UX consistency perspective. I wish MS had backported the kernel improvements and relegated UWP to to third-party apps instead of integrating it everywhere.
I must disagree with you on Office 365 though. It is a marvel. Microsoft has re-engineered compatibility with document, spreadsheet, and presentation formats with a 30 year legacy from scratch, enabled multi-user editing on these formats, and crafted a web experience almost equivalent to desktop. They've really had to innovate to keep up with the advantages of Google Docs, and while they have not matched it from a speed perspective, they're no longer out of the running with consumers. Word and Excel Online are now free with a Microsoft account, and I found them just last week to have a rich selection of templates and had compatibility with Office documents I was sent. Office 365 is also very reasonably priced for it's Family license.
I haven’t been a power user in Office for a while, but yes perhaps I have missed a lot of the innovations you have mentioned above. Cross collaboration is something our company should definitely take more advantage of, although it’s hard to train users due to inertia (so I’m left compiling all the changes as always). I agree with you that their web apps are really good now.
That said, I still find google docs much easier to use for simplicity (and I at least up to Office 2013, I knew and used every feature in Excel PowerPoint Word) - but a lot of that is UX, Windows 10 and O365 I find too “clunky” and a tad slow on some button clicks
Excel Online lacks pivot tables, which I cannot live without. LibreOffice is equally helpless when it comes to them, so I am limited to the proper Office.
I must disagree with you on Office 365 though. It is a marvel. Microsoft has re-engineered compatibility with document, spreadsheet, and presentation formats with a 30 year legacy from scratch, enabled multi-user editing on these formats, and crafted a web experience almost equivalent to desktop. They've really had to innovate to keep up with the advantages of Google Docs, and while they have not matched it from a speed perspective, they're no longer out of the running with consumers. Word and Excel Online are now free with a Microsoft account, and I found them just last week to have a rich selection of templates and had compatibility with Office documents I was sent. Office 365 is also very reasonably priced for it's Family license.