That’s a lot of apps. It’s way more than most of us would ever have on our device at any given time. That said, there are likely people out there with that many apps. Unfortunately, iOS 6 doesn’t seem to handle more than 500 installed apps at a a time.
If someone does install that many on their iOS device. It will become sluggish and cause issues with it locking up and having reboot problems. This isn’t something that users want on their iOS device.
Apple has acknowledged the problem and said that they are working on a fix. It seems that at first, Apple didn’t believe anyone needed that many apps (truly, I personally don’t see a need for that many at once, but I can only speak for myself, and not for anyone else.)
Either way, Apple will fix this in a future update. So that’s good news for folks who need that many applications on their iOS devices.
One feature I would like? Something that automatically quits all background apps. It can be a bit of a pain to quit them all if you have a few handfuls.