. Now back to the question why do you not speak on range? Only curious no Mic? Another reason maybe?
It's actually two reasons.
First, I don't speak English well. It's easy to assume I can, because I'm apparently able to write not that bad, but speaking is a whole different matter. When I type, you don't notice all the pauses when I have to rethink my wording, look up words in the dictionary, or have to completely edit my sentence due to horrible grammar.
When I speak, it's full of pauses, "ehmmm", aborted sentences and so on.
Second, because if I speak, everybody may think I'm listening too.

Yes sounds silly... but I'm almost constantly afk (alt-tabbed) during my sorties. As soon as my wheels left the ground, I'm gone. When you see me coming to my base, I'm afk. Even when stalking buffs, or climbing just a few hundred feet before I drop down on that Sherman in my HurriD, I'm afk. Everytime I think I won't have to maneuver for the next 20 or 30 seconds, I'm alt-tabbed out. Yes, it's really that bad.
Text has the invaluable advantage of being still there when I come back. Your vox transmissions are gone.
Besides that, I'm also avoiding all that boring "social" stuff... "What's up? How are ya? How's the weather in Germany.. blah blah blah"
The only time I was regularly using Vox was in my year as a AHTC member.