We already have had threads this past month where we largely agree with your annoyance; yet another one isn’t going to influence Apple further, as they do not in general acknowledge or care about outrage posts on HN. Support call tickets are, however, meaningful to them.

You’ll have much better luck opening an AppleCare support case via phone call about unexpected disk space usage one day after an upgrade and then asking them how to free the 20GB of space used; I encourage having set up the computer beforehand so that it has 25GB of space free before the update and take screenshots.