You seem to be forgetting one thing about all of this. Well, four things.
Firstly, if you dair or tilt them, they have escaped from your infinite, but if you simply choke them again, you can always dair or tilt them later. Therefore, if you can chainchoke, you always should, if only because there's no reason not to rack up more damage if you can, while simply resetting their position and getting them closer to the ledge for an easier kill.
Secondly, chainchoking refreshes kill moves. It's like G&W's uair, but IT DOES DAMAGE. Refreshing your kill moves means not only are you getting your opponent closer to kill percentages, but it also means that you can kill them at lower percentages as well.
Thirdly, chainchoking is impossible on some characters. However, it's usable on over HALF OF THE CAST. That's about 20 characters that Ganon can rack up damage and kill much more easily on.
Fourth, as to the difficulty of this technique. Screw that, there's a lot of stuff in Melee that's every bit as hard as chainchoking. They did it, why can't we?