Still clear as mud, if you ask me. Why they didn't just add a "Sync Desktop & Documents with iCloud Drive" button is beyond me. This is another "iTunes Match" problem just waiting to happen.
Yes and maybe even more critical, depending on what data we expect to be present as reference material whenever needed.
The last access date has no necessary relationship to potential usefulness.
In our real lives when we put something in the attic that was in the kitchen, we know we did it. Two years later when we break a coffee carafe, we don't look on the countertop for a different one, we look in the attiic.
Again, with this thing there's the assumption we're always connected and the sytem will say oh that's up in the attic now, you want me to bring it downstairs? Well guess what: I didn't want it taken up to the attic to begin with. But since I'm not connected all the time, perhaps it's even worse and the system is going to say "I can't find what you are looking for, please connect to the internet to enable search."
Then I'm going to be an unhappy camper because I'm in some quilters' guild meeting in a no-internet podunk church hall, having promised to show someone a chart on how to resize sawtooth star blocks. It's the first time I've needed to see that chart in four years, and now it's gone just because I haven't looked at it for awhile?
This is not what personal computing is about for me today. That was back when everything had to fit on a 400k floppy diskette. We are going backwards here without more options on what to exclude from automatic removal to the cloud. I need to be able to drill down to file level or at least tags or folders.