Your post basically reinforced what I have been thinking for years why there's that hate.
Everything you said makes sense.
In the end, what sustains hate towards Smash Bros. in general is the fact that most people think that a Fighthing Game must be exclusively built to be competitive.
That's not the case of Super Smash Bros. that from 64 to Melee were made to please both publics, so it has editable rules and people can play in the way they feel like.
People found that some rules that could be more competitive and used them in tourneys, many things were given a try, even items had tourneys with them on for a short period, people found that they are what they are and had taken them out.
Outside game rules were made to complement the in-game ones, it isn't as simple as in traditional fighters, Stages can make a huge difference.
In a game which comes exclusively for competitive audience, everything is already set to go for the best competition the game has to offer, but in a game that wasn't made specifically to that audience, things go more complex to set the best rules for competition.
The hate comes from the fact that competitive Smash is simply different of what they think a competitive fighter should be, through preconceived conclusions as nearly all the hatred against a particular group of people, also the fact that as Smash has more famous characters and a cartoonish approach, there's more attraction for younger players although they aren't the ones that actually plays the game in high levels.
It may not seem like, but Smash takes a very similar approach when you talk about bans, once the competitive rules are set, banning additional elements from the already ready rules (with elements that doesn't suit a competitive ruleset have been taken out) is taken very seriously and only acceptable when it is really game breaking.
No stage is banned from a ruleset without discussion, no character has been banned since 64 to Brawl and no tactics or techniques are banned without have really being proven to be game breaking. Items haven't being banned without discussion either.
Although things have been mimicking the traditional fighters rules, such as 1 on 1 fight, that's just because it's the more appropriated way to fight in competition. Although there's the doubles category to be taken in consideration, it's great for competition and is very unlike traditional fighters way of play.
, and c.viper >___> nintendo doesnt have as large of an option for characters, or good chars. 
