To keep the games even. Look how much complaining you get for keeping the games EVEN. Imagine if Wii U got Ice Climbers, and 3DS got (For the sake of argument, and keeping with Veterans...) Mewtwo. Would you prefer this to slashing Ice Climbers? (Actually.. Yes. Yes I would. Fuck you Nintendo.)
If the Wii U has SSE compared to 3DS's Smash Run, then that is unfair, and not even. But Smash Run will have an equivalent (I'm assuming. If I'm wrong, then riot.) in Wii U, not a lesser/better game mode. Charater differences, on the other hand, is a MASSIVE loss/gain for the respective system. Worse, what if instead off 3DS getting a veteran equivalent, it gets NOTHING? Then the Wii U is the better game, by a large margin. Then no one buys the game for 3DS, and the ones who do, well. Either murder or suicide would spike on release of Wii U.
This is long winded (For me.), and terribly formatted. Basically, sales are better if they cut Ice Climbers. that's IT. Make it without IC and make profit, or not make it and at least not lose money. I would prefer IC-less (And, even Lucas/Snake/Wolf-less) Sm4sh, to no Sm4sh at all.
This is a very simplistic overblown opinion. For all those who read this, sorry. LUCAS.