I can't imagine many people agreeing with you here.
You need to be (a) able to walk and drive, (b) in driving distance to a post office and (c) able to work around the post office's opening hours and (d) willing to waste the time to drive/line up etc.
Or you can spend less than a minute to upload a photo of your passport.
Which is great until someone impersonates you by spoofing a photo of you that satisfies “liveness” detection. It’s a lot harder to AI up an animated image in person at a post office.