Mainly because they have no lights, therefore can't represent the state of your clip slots (empty, clip present, clip playing, clip recording) and you can't navigate and select which area of the session you want to control.
No, with an APC or a Launchpad (or a monodeck, the mother of all session view controllers) you don't.
That's the whole point about those toys.
dude, some blinking lights don't tell you anything except clip is on, or off. unless you memorize everything, you're lost within 5 minutes if you have a complex set. it's ok the way it is, although bulky especially the apc. plz don't overdo it, the apc is good, but not THAT good. you need lcd screen. which is not a bad thing either.