In fact, in previous OSs the Recents view always showed all the pictures in the Library in order of date added. The Library view in previous OSs always showed all the pictures in the Library in order of date captured.
Now in OS18 there is one view, called Library, that can do either, depending on what you tell it you want.
When you first open Photos you see the Photos view, like this:

with the newest pictures in the middle so you see them first. Then scrolling down gets you to various collections, and scrolling up gets you to the Library view:

And in Library view, on the bottom of the screen there is a Sort menu. You can choose whether you want the Library view to sort by Date Captured, just like the old Library view, or sort by Date Added, just like the old Recents view.
You still get whatever you had before, but it's all in one.