Please don't try to play logical word games with me. Just don't.

If you're trying to say not being able to chat is not a factor for winning or losing, I'm sorry but that's quite wrong. You can do everything right as a healer or DPS, but if say, your tank 10 stacks and tries to keep fighting, and you can't tell him to fall back or risk losing the medals, then he does and you're unable to recover, you lose. And it was purely that lack of ability to communicate that could've made the difference.

Other scenarios, based on my own experience:
- Trying to tell and show your teammates they can get out of a deadlock battle on the bridge by jumping the fence or taking the stairs and going around the enemy team
- Telling your teammates not to stay bunched up while fighting against casters
- Spotting someone with a bunch of medals trying to hang back in an area you can reach, IF you don't simply stay tunneled on the overall skirmish
- Seeing a NIN with medals hide and knowing several teammates can use Detect to stop him
- Coordinating a focused attack on a healer who's used all their big cooldowns
- Shifting focus to someone showing obvious signs their about to burst

I have won and lost matches purely from either being able to/not able to communicate these things. And quick chat just can't hack it. Yes, these are specific, and not everyone will run into similar situations. But that in effect proves my point about quick chat. No two matches will ever be the same, so a rudimentary chat system that barely covers basics won't be enough for unique situations, or anything that falls outside of what they cover. Thus, it's not an effective replacement for full communication, and let's not try to delude ourselves into thinking it ever will be.