On the part about change, I'd say, if anything, the Smash 4 community welcomes change, because they are able to. Diddy was OP as hell, hoo-has out the ass, people wanted that changed because he was far superior to any other character, people wanted other characters to be viable, and so Diddy got nerfed. Every character in the game received balance patches that the people wanted. If anything the Melee community is resistant to that form of change because it's not possible. Melee is out, it's over a decade old, it can't be patched. But from what I've seen, Melee is all for change in terms of practicing and perfecting other characters who aren't the top tier, trying to bring them up and show that they can be used viably. That's exactly what Amsa did. Amsa came out of Japan from fucking nowhere and beat Mew2King (the 4th best Melee player in the world) and he was playing Yoshi. A random guy playing a mid-tier character beat a lifetime pro playing a top-tier character, because he played his character well enough. It caused people to rethink the tier list and how characters are used, and Amsa gets a ton of respect for it.
And you call the top dogs in the Melee community childish, but at the same time want to see the winner hurl insults at the loser? Losing is already bad enough, there's no reason to be a dick and pile insults to the guy's face on top of it. Just shake his hand, show respect for your opponents.