Re: Replacing Office is the easy part
I might agree with you in principe, but experience and decades of studies of "change management" (Who moved my cheese?)suggest otherwise. As do some migrations from, and then back to Office, because things didn't work as expected.
SWMBO is happy enough with OpenOffice on her machine instead of MS Office, but then I get called for anything unfamiliar such as, I don't know, copying formatting from one cell to another…
I actually think that moving people from Outlook to something else for e-mail and calendars wouldn't be that hard, because Outlook seems to break every known (and some heretofore unknown) rule on usability, but they will want to be able share calendars and, the pointy-haired brigade will want to be able to delegate their inbox to their assistants, and I haven't yet seen a client/server solution for this that I think looks acceptable.
But back to Office and I'm unapologetic that I think that many people will object to the look and feel of LibreOffice and it's not worth the fight over this. And it's the look and feel that matter. Other solutions including SoftMaker and OnlyOffice are available where most people, apart from the Excel junkies (and I've had to look and work with the source of pivot tables!), and the Powerpoint brigade, would hardly notice the difference. The Excel lot can probably be persuaded to switch to Jupyter Notebooks without too much difficulty, but I don't think there's much hope for the coloured crayon brigade: B Ark, or round the back of the house for them; and then shots might be heard. What an awful clusterfuck of a program. Of course, anyone wanting Access gets taken straight to the BOFH's basement, to get a special introduction to the new version.