You think wrong.
All clans DO use voice-comms in clan games ( well, any clan worth playing does ). However, most/all clans STILL use the v-says ingame.
Basically, that’s because you have to press a key to talk, so it’s easier to tap ‘v-2-1’ as it is to tap a key, say ‘I need a medic’ then release the key. The problem being that for the duration of you saying that, one of your fingers is used ( and possibly more, if your comms key requires you to move your hand from your movement keys ). Furthermore, with v-says, once you hit the ‘v-2-1’ ( or whatever ), it does not require your attention for the during of the comms message, AND the comms messages come across in a CONSISTENT form. Good players here the ‘I nee-…’, and already know how it ends by the pitch and timing of the v-say - it’s the same every time.
Sure you can use auto-talk rather than using push-to-talk, but this has the huge disadvantage of then transmitting every ‘F**K, OMG I DONT BELIEVE THAT’ etc etc. And this can be even worse than no comms - you can’t hear relevant details, v-says, OR in-game action while somebody rages up your comms. ( Hence push-to-talk being a good option )
Voice comms do have advantages though, big ones that ensure that they DO get used in every clan game. You can call splits, class changes, mention area’s of weakness in enemy defenses as you find them - things that v-says aren’t flexible enough to do.
However, I patently disagree with your absurd motion that v-says are out of date.
In conclusion - you don’t use voice-comms already? OMG… your clan must be easy to beat 