Pvt_ParrotCitricit would be hugely beneficial to both competitive and casual to improve the quality of voice chat.i mean cs:go's engine is modified but it's still Source so what's the problem??
then again, why couldn't they reuse the basic principles of matchmaking from it, like normal server picking so you dont have 9000 ping and, you know, RANK CALIBRATION??
Because while TF2 and CSGO are both Source engine they are very different versions of source, you can't just copy + paste it. That's why they couldn't just copy CSGO's matchmaking system and change it for TF2, they had to develop it on their own.