There are posts on this thread from people who use Photos like I do who are complaining about the functionality being removed. There are a lot of other recent Photos discussions along the same lines and many of those complaining also use it like I do or relied on the Recents/Camera Roll functionality. If you don't synch your photos to Mac Folders via Finder then you can't possibly know that previous versions of Photos separated these pics from pics taken with iPhone and how important that had become to people's workflow.
There are a lot of people, like you, who really want to help but because we use photos in such fundamentally different ways you see this mostly as a problem of presentation and organization which just needs getting used to whereas we see it as key function/capability of Photos being removed with no alternative provided - and this has caused some friction over the subject, which is a shame. I suspect that the teams who decided on this change don't use Photos like I do and they too would be mystified by the clamour that people like me are making about it if they read these discussions.
I've got a work round, I can live with it, but I suspect that Photos is going to get worse for people like me, not better.