Very true. You don't actually need to speak, just be able to follow the raid leader's orders well on vent. So your voice not be the real problem, you could be talking too much and people don't like that very much. Cheerio.
My group did well in Kara last night and I didn't say a word to the group over vent. As long as I am told they need me to do something or they listen when I have an idea I could care less.
Our pali tank was having a hard time pulling the guests in front of Morroes at the table and was getting ready to try again and I said before he did via text. Hey, lets try something different. so they stopped and listened to my idea.
I told him to go behind the pillar in the back of the room and I would misdirect the group to him. being they are mostly ranged mobs he was having a hard time getting them to him. So we did that and it worked quite well. I misdirected laid an explosive trap down and single shot pulled one of the group. Once they all came rushing in I finished my agroo misdirection with a Volley + multi everything died real quick and the group was happy I had came up with the idea.
They are right. Convey any concerns you have via text if you are getting kicked due to your voice.