iCloud > iCloud Drive vs Documents. How to think about those?

I recently started using iCloud for documents. I moved my ~/Documents folder to iCloud. So ~/Documents no longer exists. But now I have:

iCloud Drive seems oriented toward iOS organization where documents were stored in folders named after the app. I think this is historical now, but persists. Documents is what it's been for a long time on macOS.

OK I had missed something. The Documents in the screenshot above is probably an alias as iCloud/Documents is there along with all the folders named after apps.

I see little reason to have Pages documents in a folder "iCloud/Documents/Pages" and organize those on my own. One of the folders was created in iOS and seems to be acting like something that should be in "Application Support."

I don't want to fight Apple's way if I can avoid it, but any ideas on how to think about this? I don't use an iPad and do as little as possible writing or photo sorting on my phone. I prefer the desktop. I still have Dropbox for historical reasons and it syncs much faster, but can see giving it up if iCloud gets faster.

I'm heading off on a long trip without a macOS machine and it has me thinking more about organization and what documents I won't be able to read while traveling.

Not a very cogent question, but what's the way forward to organizing documents? And how reliable is iCloud? I know not everything is stored on my iPhone.

Also confused about why I can't select both iCloud on Mac and iCloud on iPhone for topics. Isn't that what the cloud is about, supporting both?