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I think that's pretty normal for pet cats: mine are like this. However, I don't see how it's useful for stray cats. You can't just pick up a stray cat to look at its belly. A clipped ear you can see from a distance.
yes, i should clarify that LA has a pretty effective no-kill cat rescue network (even sending rescues to other states for adoption), so most cats here are neutered, chipped, vaccinated, and tattooed when rescued and adopted out (e.g., my sweet little rescue cat). but there are also dedicated TNR volunteers who strictly neuter and release stray cats and employ the ear-clipping method for that reason (easier to see fro…
Nothing is foolproof, but you can use binoculars to see feral cats' ears from a distance if you really have to. Most stray cats, in my experience, are NOT friendly at all; they won't let you come close enough to them to pick them up, and if you do they might fight you.