Okay, that makes more sense I suppose. Still kind of a lame advantage, but it has it's uses.
Apps like Ventrillo & TeamSpeak are unfortuenatley a necessary evil if you're going to be competative. By their very existance they put non-users at a disadvantage cuz ya never know if the team you're up against is useing it.
Even though most CAL matches are set up for team-view only, the dead can still talk to the living saying things like "Killed in the B tunnel. At least 3 boggies present. Killa's awping from spawn...again. Proceed with caution"
That's valueable intel that the living may or may not know that could end up saving their bacon.
It's also possible to set it up to where squads can talk to their squad only or to everybody at the same time which has it's advantages as well.