True. But it can be a non-trivial amount of space, and (especially on SSD) that can matter. The first review I see for AppCleaner on the MAS right now is from

True. But it can be a non-trivial amount of space, and (especially on SSD) that can matter. The first review I see for AppCleaner on the MAS right now is from a very happy user who just reclaimed 19 GB on their MacBook Air after a first run on a 4 year old machine. For that user, hard not to disagree that that matters. Also: 7 GB was from AirMail not deleting its 'junk'. If that junk was in fact its internal cache of emails then that user has thought that those emails had gone with the app, while in fact they were still carrying them around. Now that could be a very big deal. (Unfair to assume, but a reasonable scenario).