Nope! Just decided to be a disappearing asshole for 36 hours and come back like nothing happened.
edit: thanks to all for the different perspectives. he is fixed, has all of his shots, and has his own temperature contolled kitty condo (aka the laundry room) that we put him into every night. we have a pretty good network of neighbors and pieced together his activities via security cameras. he's a mouser for sure and that is his job until he decides to retire.
You just checked that they aren't escape proof, and then you say it is perfectly safe. No it isn't. A cat doesn't need to be an escape artist. They can get spooked, they can see pray, or decide the harness is just not comfortable to them. I specifically was talking about them pulling back on it (which you can't really prevent 100% of the time) like in this video here https://youtu.be/gvfqXeKrfbQ?si=GiDGG1SdkIo1vkgI
You're going to have to do a lot better than a video clip and proving that any harness can be escaped to convince me that their use is no better than allowing a cat to free-roam.
The mere use of a harness already shows the cat-owner does not want their cat out an about on its own. If it pulls it off they aren't gonna go "oh well, it'll come back when it comes back" the way outdoor cat-owners do.