There was a time when people had server channels and used mIRC for it long long time ago. The idea is similar except now you have ts integrated into the same program. Personally I never cared for TS cause of the bad sound quality and it was always missing the most important one, the chat. I never saw a reason to stay on ts any longer than you are actually using it but discord makes it fun cause of emojis, bots and the chat. Also usually when you are offline I never had contacts to ppl without logging in to the game since no one actually stayed on ts either. Discord just makes it so much easier to ask your friends if you are even going runatorium without the need to actually log in. Discord is pretty nice on phone aswell so I'm still wondering why ppl even use anything else than Discord.