Just say you have 15 pages worth of apps, obviously 4 pages wouldn't show on your iDevice. But if you search in spotlight, it will find them! So that's a great way to have heaps of apps.
If you have 15 or more pages of apps, chances are you're gonna put the ones you don't use that often offscreen. And because of that, you most likely won't remember what they are, so you can't search for them. We need a Catagories like app solution that actually lists them..
This has been a feature since as early as the appstore was available. Using an app called QuickGold, which did the same thing as the Spotlight feature but better, you could launch that weren't visible. @arta I push apps like weather, stocks, calc, off the screen. They are apps I use only rarely but always remember that they are there. I just launch from spotlight when I need them