Re: "its rich tradition of fixing one thing and breaking another"
Nope, no such forewarnings from Office. You do get notified at the *end* of the process why your apps were suddenly shut down though, which is nice...
On the subject of the "5 minute warning" that W11 gives - I also had this recently on my personal laptop after asking it to do a network reset whilst trying to resolve an out of the blue loss of connectivity to my network shares. The only problem with that warning was that it failed to indicate that 5 minutes wasn't merely Windows being nice and giving me a bit of time to finish what I was doing before it auto-rebooted, but actually a delay period *required* by the network reset process to give it enough time to complete whatever it needed to do.
So, as Windows wasn't then giving me any other sort of indication that the reset process was still doing anything behind the scenes, I figured that since I wasn't doing anything else with the PC, there wasn't any need to waste time waiting for the auto-reboot and so I requested a manual reboot.
At this point, despite Windows presumably being well aware 1 that the network reset was still being worked on, it then accepted my reboot request without the slightest murmur, and thus it came to be that a few seconds later after I was logged back in again, I found myself now sat in front of a laptop which was not only still incapable of connecting to network shares, but had now also rendered itself entirely devoid of any sort of network connectivity... FFS.
Some frantic searching on my phone later, I then learned about the whole "non-optional 5 minute delay" thing in relation to network reset requests, asked Windows to repeat the reset, sat on my hands whilst the 5 minute delay prompt was shown, then crossed my fingers as it auto-rebooted, and breathed a massive sigh of relief when, upon THIS restart, all network connectivity was back to normal.
So yeah, even when it looks like Windows is being all user-friendly, it may well just be getting you to lower your defences so it can deliver the takedown blow... Never trust it, always assume it's out to get you, and remember that it comes from the same company which thought releasing Clippy on an unsuspecting world was an entirely reasonable thing to do.
 though then again, if it needs a hardcoded 5 minute delay to be sure that the process is complete before rebooting, then perhaps I'm being too generous here over just how much knowledge Windows has regarding the ongoing status of a process that Windows was told to initiate to reset part of the Windows system...