I think this is somewhat true, but part of what you're describing is simply a failure of categorization. My take on that is that while putting people in boxes is perhaps a useful way to trim the field to something manageable, it is inevitably error-prone and leads to false generalizations. Human beings are unique and even if all I'm looking for is a half hour romp, it pays to remember that and judge each one on his (or their) own merits.
That said, there's also a component of our own perspective shifting as we get older, more experienced, and (hopefully) wiser. I am very much aware that I am a lot less tolerant of BS in the hookup arena than I was 20 years ago - I know what I like, but even if a guy fits that description (which isn't crazy narrow) I won't put up with endless chatting to no purpose (are we gonna fuck, or just talk all day?), people with neither pic nor stats, people who cannot converse in sentences of more than one word... the list goes on. As a result, I probably have a lot less sex than I could, and I certainly have a lot less than I'd like. But my sanity and equanimity suffer a lot less, and I waste less time online.