With a bookmark that was saved to my Home Screen, long pressing the name of the web site icon no longer gives you the option to edit just the name. At some point during ios 15 I discovered this ability by accident. Previously if I wanted to do this, because either the name was too long to be displayed correctly or for any other reason, I would have to delete the icon and go back to the web site and repeat the process of saving to Home Screen and edit the name there and then save again. Being able to edit just the name of a specific icon, bookmark or app, without triggering the the wiggle was a major convenience. I don’t know when this changed, whether it was before 15.4 or after, but I do miss it.