I get it... I get the idea behind why it's not included. That doesn't mean I have to accept it.
Although, I won't miss it at all actually.
My younger brother is your atypical CoD player, despite how much I've tried to get him to mellow out when he plays, but no, be it Destiny, CoD, or even Mortal Kombat X or Fifa, it's obnoxious and headache inducing. His friends are no better. And I can really do without that in my Splatoon, especially when these kinds of players will likely be mystified by the fact that kills don't mean anything in this game.
And with each turf war round being what? Two minutes a piece? The argument of "Just mute people" does not fly. The game is too frantic and archaic to spend half the round muting people.
I do however believe in options. I might not ever use voice chat in game, but that doesn't mean I don't think others will, or would get use out of it.
If it can be patched in down the line, brilliant. If not, well, c'est la vie.