Why "/mute all" unmutes those who were already muted?

because riot is just a small indie company, they cannot possibly afford to create a better mute function

It's a bit weird, but it's because /mute <player> will unmute a muted player, and /mute all is basically just /mute <player> done to every player.

It's just a mute command

I know right?

HmmMmmmmmMmmmMMmmmmMmmmmmmM