The only time I've felt the need to squealch range vox is when folks insist on discussing politics there. Any other time when language or behavior gets out of hand someone usually makes an appropriate remark like "less talking, more killing" and that ends it.
But that's just Rooks and on West coast flying hours ... I don't know what all kind of stuff goes on elsewhere or at other times.
Want the mission planner to get used? Make it so that base capture is only possible if posted in a mission, and only possible by those who join that mission. So there. Nyah!

You probably want to have a EZ-Mission deal so somneone can quickly rig "attack A2 from A1." Likewise provide a quick "defend A2" mission. And allow troops to originate from anywhere to affect the capture due to the P-n-A crowd. Let people join in-progress up to some maximum number of players. Oh, and then give people who joined and succeeded some damn perks for it. Likewise if the defenders kept the base long enough to make the attacker's mission fail, they get perks.
Would people whine? Sure. Who cares. If the game plays down to idiots then all you get is a game full of idiots. This way you'd at least promote more organized play - even from the furballers who could go from place to place as a defensive unit. And freelancers could still pork-n-auger all they like - they just wouln't benefit as much as the guys who work as a group. Would it solve everything? Hell no. Would it still make sense 6 months from now? Who knows? Would it stop The Horde? Nope - but at least it may get people looking more subjectively at non-overrun parts of the map.
Overall I agree - and share the frustration - about having a game system where only maybe half of its features and assets (planes) are really used.