No, the different uses of the c-stick, like how how can do aerials with it (this is, among others, the only way to do an uair during Peach's 1st jump before it's reached its peak without automatically DJC:ing it).
Hold up, press X/Y, press A. Tadaa! - Will not work if you're trying to uair with Peach. She'll DJC.
You can also move forward and do a bair without losing any momentum (the same works for fairing while moving backwards) and also (smash)throw items while moving forward/backward in the air without losing momentum.
Just tap light enough. - No, it doesn't work this way. In order to bair while moving forward or fair while moving backwards, you have to let go of the direction and then tap in the other to perform the move. You WILL lose momenting.
Fsmashing will instantly turn you around.
aka, just like one done with a control stick slam + A button. - Slower!
You can usmash out of the shield with the c-stick (and also dashcancel into an immediate usmash)
I do that all the time with the control stick, and it's not a single frame slower. - I'm not sure, I haven't tried it yet (since Helios still has my copy of SSBM), can you actually usmash out of your shield without using the c-stick?
use it for dashcancelled immediate dsmashes (it's kinda "duh", but n00bs don't think so)
Can also be done by pressing control stick down + A. - Oh yeah, if you want to either have the staggering animation come out before the dsmash or have to tap down to dashcancel and then down + b to dsmash. Either way, c-sticking it is inifinite times faster.
jump out of the shield with it
Press Y/X/slam control stick up. - Never claiming what I listed were things you can only do with the stick. But they are things you can do that isn't always obvious
use it to crouch cancel and to combine crouchcancel with DI
Be fast enough on your fingers, and you can do that with the control stick. - No you cannot. You cannot perfectly DI a tipper for instance while CC:ing no matter how fast you are. Hey, you can't really perfectly DI any attack without DI:ing it before it even hits.
smashthrow items like the beamsword instead of having to combine Z with the control stick...
Takes some training, but possible. - C-stick, faster, less prone to mistakes and just more practical
If you tap the c-stick during an l-cancel you will do a roll the moment the l-cancel is over.
Press R/L + left/right. - It might come out slower than just c-sticking it if you time it wrong
As I said, the only thing it can do that control stick can't is change the camera angle. [/B] - But most things can be done faster, better and/or more effectively using the c-stick.