Why can't Gangplank peel
...anything but oranges?
...anything but oranges?
Because oranges are awesome.
Because they want to make him a fighter, not a support. He has a self-cleanse and a speedboost to peel himself away from enemies, if he had reliable ways of peeling for his teammates then his damage would have to be nerfed.
I've got mastery 5 with Gangplank. (I know that's not a big deal, but at the very least it means I've played a lot of Gangplank) He actually peels very nicely, since that speed boost is also a relatively large AoE slow. I was only making an orange joke.
Peeling with GP looks similar as with Darius https://www.youtube.com/watch?v=8sYaMB5T0_4