We stopped adding in icons once we started working on fighters
before their game even released.
Ok, but who isn't relevant anymore? Retro fighters. Believe it or not, being in Smash doesn't change the fact that not many people know who the Ice Climbers are or what the heck R.O.B. is, especially the younger audience,
which Nintendo is trying to marked this game to.
On to some other not-so-relevant-anymore fighters:
: Shouldn't have to explain this one.
: Hasn't had a game since the Gamecube.
: See the first sentence
: Hasn't made a major appearance outside of cameos for some time (not including non-canonical titles)
: See above
: Has barely been in a main story line game (same logic as Marth and Roy, I guess)
: Has not appeared in a Metroid game in almost a dozen years
: Has made a canonical appearance in one game that was released two decades ago
: Lesser known Belmont, wasn't even widely known until after the direct, since not even the leakers could predict him
: See Sheik (Ok I guess Majora's Mask counts but that game is almost two decades old)
Perhaps you disagree with me on a few of these, but it's undeniable that some fighters Smash is supporting aren't doing anything themselves. And if I should repeat it again....
they worked on a fighter before their game was even released yet.