Oh, I won't argue that Smash isn't a fighting game that is played well by the pro's lol I've seen the pros play that game and holy fuck, they know some pretty awesome tricks and techniques that make me shit bricks lol But Smash wasn't originally intended for professional tournament play. It's definitely come to that point, but at the end of the day, it's still built as a party player game that -can- be played professionally if you put the time into it. It's a party fighter first and a competitive pro fighter second.
Vs. games like Guilty Gear, Street Fighter, BlazBlue, etc. which are games that are originally intended for heavy competitive use. There are so many things that separate these games from games like Smash, Mortal Kombat, etc. Things like proration frames (which can include tracking the actual frame count and make your attacks based on that to do more or less damage), tiger knees, button triggers/"latches" (where you have to hold down a button for a pre-determined amount of time and the move won't active until you release, sorta like charging, but not really), separate combo builds for separate characters that go a lot further than just having different moves assigned to the button commands . . . so much stuff lol
Not saying one is better than the other. Both are played professionally (and well) but comparing them is like comparing apples to oranges, or in video game terms, RPG's to first-person shooters. They're so exponentially different that grouping them together is doing them a disservice from both ends xD" (as in they both have their own mechanics, good and bad, that separate them)
