HFS+ was terrible, but at least I knew most of the ways in which it was terrible.
I've always found Spotlight to be utter garbage, but that's not the fault of HFS+.
The system requirements for HFS and HFS+ reflected this and partially explain why there was little progress for literally years at a time.
https://arstechnica.com/gadgets/2011/07/mac-os-x-10-7/12/#hf...
Eventually, you have to start over.
Drag the app to the trash?
My complaints re disk space are mostly still around because SSD prices are still not cheap compared to spinning disks. For example, I went from 80 GB (2005 Dell Latitude) to 120 GB (2007 MBP) to 256 GB (2013 MBP). Desktop drives at the time were probably triple to quadruple the storage at half the price, so it's still an issue.
To migrate everything to an SSD in my next machine will take somewhere between 1-2 TB, and last I checked, the 1 TB option on a MacBook Pro was $600.
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).
The fact that the Installers don't do well with this kind of situation is probably an indication they should survey the landscape and buy one of them so it can be integrated.
There’s also things like Garage Band’s downloaded instrument files, which do stick around... but only because other apps (e.g. Logic) can also use them.