Perhaps on systems that provide voice chat out of the gate this isn't an issue, on systems that don't it is. I don't think I'm familiar with a single modern squad/team-based shooter that doesn't have voice chat.
You can go play those other shooters. The charm of Nintendo is that they are different. Why can't Nintendo fanboys have this one shooter? Go play all the other ones. Why must you insist on ruining Splatoon for the fanboys who don't normally play shooters?