Yes, but I am often looking at 10 or 20 things at the same time. I don't need to "read later", I need to read all of them now. I'll probably lose like half my trains of thought if I have to wait multiple seconds to switch back to page rendering one of the other umpteen search results...
Well, yeah, at the scale of "real research" it doesn't really work. But you wouldn't want to do that on a tiny screen even if copy/paste was up to it. You probably wouldn't even want to do it on a laptop screen. That's just a tool/task mismatch.