If you don’t have comms please consider it
I agree. If you are not riding alone. The OP’s video above is a good example for the reason.
I had a wired rider-pillion comm with my wife as a passenger for many years. I preferred her to tell me that we needed to stop instead of her banging on my back (a universal sign for wth-????), and I was able to warn her to grab on tight when I decided to pass someone. Unfortunately, she developed back problems and that severely reduced her participation in riding with me. Then, a couple of my friends and I started to take rides and trips together. After a few times we lost someone in the rear view mirror, we decided to get wireless comms - as ridiculous as they appeared on the side of helmets, we agreed to give it a try. We all got matching ones, and we are happy that we did. We don’t talk much, - if at all - on rides, as riding for us is a time to enjoy the scenery, and get away from it all for a few hours or days, but we all appreciate an occasional heads-up on having gravel on the road ahead or if someone needs to stop unexpectedly.