[misnome]

I'm curious; what user need is there to create ISO's vs the current way updates are distributed?

I can think of a small handful of corner cases (making iso's for e.g. virtualbox, whose OSX support is extremely minimal), but nothing that most users, or even developers, would run into on a day-to-day basis.

[Synaesthesia]

Sometimes you need to do a fresh install of a particular version, eg I had to install Mavericks for a guy for Pro Tools 11. It’s also a good way to install onto fresh media or do a clean install, or repair macs.

[em3rgent0rdr]

Maybe to replace the hard drive or fresh install. Or want a backup to return to after testing out a linux install which might fail.