There is no objective proof that Charger A is better than B. Not typically. There are preferences, and those will lead way to eventually a market that picks a winner - maybe, typically, IDK, free market works when it's actually free. Which it isn't a lot times people rant about it.
The absolute worst thing we could do is go to Apple or anyone else and say "You need to use this x or y, because someone else does". That isn't going to breed innovation, ever.
Do I wish Apple used USB-C on phones? Definitely. Does it actually change anything for me day to day except I need a specfic cable if my phone runs dead? Not really because my chances aren't a ton better running into a USB-C on demand. I want Apple to. I would buy an Apple phone with it if given the option. I would never sign-on to force Apple to do it.