I am against ingame talk actually, all you're gona hear is profanity anyway, atleast is solo games. In duo mode it's fine but, you're gona use third party software for that anyway... so no ingame talk except when you're dead i gues... to talk with the people who were eliminated... friends in solo thing, i dont think it's going to be that much of an issue if the connection to the game are random, spawns are random, no name indicators eccept when you kill or you die by someone. You wount know if it's a friend or foe if everyne looks the same, except for skins, but in that case are you willing to risk and not kill someone becouse he wears the same helmet as your budy does... i wouldnt.
Thing is, friends in solo game is a problem you cant really fix in game, you have to deny connecting a player to the game in which his friend is already connected to, and to play duo your friend has to be on your list of friends. i gues people will be creative and not add each other to friend list, just to try to play solo game with friends, but there is still the random thing that makes the problem smaler.