Melee being "too hard" and "too technical" is primarily Sakurai's fault.
After all, he's the one who invented Z and L-cancelling. There's no reason it should not be an option. His reasoning that "it would be too fast for non-super competitive players" is crazy.
A lot of the mechanics in Melee require very precise timing that require hours and hours to learn. Honestly, if they were made simpler by design, you could still have the same cool things, only easier to perform.
However, harder doesn't equal worse game design.
Regardless, I think a lot of what Sakurai says is mostly the techniques. However, what he is ignoring is the fact Brawl has MORE SUCH ADVANCED TECHNIQUES!!!! Although very few of them require as precise timing as Melee, some of them do to a crazy extent.
I think that's what he's trying to get at, but he doesn't explain it properly/doesn't understand competitive play (and his games competitively) well enough to do so.
He also ignores 64... >.>
Lastly, he's dead wrong why Melee is popular, and he's an idiot for thinking that. Melee is popular because it's damn fun, pretty well balanced, comebacks happen, the combos are cool, the edge/on stage game both have huge roles, and quite frankly anything can happen. That makes it a player, viewer, and livestream favorite, whereas Brawl and 64 don't have that same level of appeal for all 3 points-of-view.
Also, hard work is supposed to pay off. Sorry, but I'm a capitalist, which is why I believe in hard work. The people who work the hardest at 64, Melee, and Brawl win those games. That's why Mango beat everyone at EVO and MLG this year: he worked harder. That's why Isai always wins in Smash 64. That's why Ally, Mew2King, ADHD, and others are constantly winning Brawl tournaments.
That's why a game released in 1999 by HAL Laboratories and Nintendo was successful whereas a game released in 2012 by SuperBot Entertainment and Sony wasn't.
I mean, I get he doesn't want there to be a barrier there, but you don't have to be a prick about it and act like you know more than anyone else.
After all, games are for the consumers to dictate what they do in games, not their creators. That's why video games are open-ended, and why they put the control in the HANDS of the PLAYERS who payed for them with their hard earned money.
(God I want the Tekken team to take full-time control of Smash)