Actually, no, it's not really what happens when you put Melee into Brawl.

It's basically an attempt by the Brawl+ guys to fix Brawl, and make it more competitive. They took out tripping, they added hitstun, they eliminated the dumb infinites, etc.

It's different monster than Brawl, and it's actually more similar to Smash 64 than Melee due to the way hitstun and combos work. However, there is still DI, so it's not as broke as 64 was.

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"Believing in your friends and embracing that belief by forgiving failure...
These feelings have vanished from our hearts" ~Igos du Ikana, Majora's Mask