It's not communicating, it's just DEMANDING a role by instalocking, not giving 1 bit about the rest of your team. Which just results in stupid games with stupid comps and stupid people. I never lock my champ so I can choose my champ depending on the rest of my team. I don't have to say a single word to do that. I don't mind people typing their role or whatever, I hate the race to type it asap, get the champ and lock in. I just had an Olaf solo top, Jax jungle, Ez and Soraka bot all instalock. So basically we had 0 AP, no tank and only midlane left. Thank the lord I have a midlane Galio runepage so I could deny their LB and win the game. Could have instalocked my Ahri or Orianna too and probably lose it hard.
Now if they wouldn't just demand a lane, isntalock a champ and actually ask if they can get that lane, get a champ depending on the team etc. it would increase your overall wins drastically. That's what I mean with communicating, not just shouting a lane and flame when someone else took it.