Sure mandatory installs stem from multiple setups, which is "one" of the reasons PC's do it. In the PS3's case, they also do it because it's easier. Some devs can do it without the installs, kudo's to them. Some dev's just can't. And I'd rather them do a mandatory install then send me a shitty game. Whining about it isn't going to change the fact that they don't know the hardware very well.
I guarantee you if the 360 bothered to ship a hard drive with every console, they'd use mandatory installs to cut corners as well. This generation was a huge leap for tech as far as consoles are concerned and some devs just aren't up to snuff yet. Can we just agree that this is minor and be done with it?
From 0 to KICKASS in .stupid seconds.