Ok so a squadmate of yours runs a mission and not thinking he tells everyone mission channel is your normal squad vox channel. You log in a half hour after the mission done. Vox channel is full of people half of which are not your squadmates. You don't like to be rude and ask people to leave. Yet for an hour voice channel can not really be used to plan a mission.
Or if you have a stalker say your normal voice is 150. If he tunes 150 text he'll see any text that comes across, but won't be visible in your voice channel window. So he can in effect listen in to any plans that get typed into that channel. He can then contact someone on another side to ambush your flight.
Or you happen to get some loudmouthed drunken boor who's stumbled into your channel. He's cussing, swearing, howling at the moon disrupting your night.
If only there was a way, ANY way to "clear" or remove someone from the channel.