So I understand the first one, if you don't want an app open handling them. I still usually just open email or calendars when I want to check them, and close the tab again after, but also don't have a job that requires me to constantly monitor them.

The second point I guess I do as well in short term, but more whatever I am actively, currently try working on. I've never needed a long term organization for that, though, since it was always more like having several loose leaf papers spread on my desk and less like putting multiple bookmarks in a book and coming back to it over several hours or days. If there's no need to use it in the next 20 minutes or so, I just bookmark and close it.

The third I just really don't grok. Maybe I just really need a tidy browser workspace, but I usually have one, maybe two tabs open at a time when I'm not actively using them and referencing between them. I dont have any tabs that can be forgotten, because I close them immediately after I use them and no longer need them right now.

I guess it is no different than having bookmarks for everything, except I can hide those. I just hate the "look" of a bunch of tabs open (as a personal preference).