Should MTB helmets have Communication Systems? Do they already exist?

I recently added a comms system to my motorcycle helmet to use with my new Vespa Scooter. I've enjoyed it so much I started searching for a mountain bike helmet with similar technology. Surprisingly, I couldn't find one. I found road bike helmets, but not a full face mountain bike helmet with comms....does this exist and I just couldn't find it? Should we have this as an option? What do you think? Would you use a mtb helmet with a communication system? Comment below