mmm... chat with the party, advise PT to set up a BR. navigate more easily to my next desired TP ability, Take a drink of water, eat a cookie. Respond to the tell I got mid battle, mid battle. Blow my nose.
"Everything except actually playing the game", in other words.

This, gentlemen, is exactly why this idea is ridiculous.

Communication
It's called "voice chat" and it was mentioned in the OP. Nobody buys this excuse when better alternatives to promote communication already exist. Sorry.

Also, if communication by chat is the goal, there are still multiple much better ways to handle it that do not affect the game negatively.