I come here...a lot. So I often hit the "new" button because it's easier than clicking into the circles, etc.
It'd be really cool if "new" meant "new for circles I'm subscribed to" and not "all posts sorted by new." Because if the ones I don't fit in are having a great day, or someone just likes posting multiple things in a few hour timespan in one of the "irrelevant-to-me" circles, it clogs up Ye Olde Feed. And no one likes clicking into the individual circles, that's kiiind of a time sink.
I know someone will point out how the "new" button works, and before you do, please let me assure you that I am aware of how it works and am suggesting a different use for it.
Alternately there could be a third button. "New (sub'd)" or something like that.