>The escapement will have a longer overall lifespan, and may need servicing every couple decades, as opposed to a new battery every couple years.

My Citizen Ecodrive needed the first capacitor change after 17 years of daily wear. Literally zero service to the watch before that.

Also I really really don't buy that this mechanical movement won't need service every couple years like pretty much any mechanical watch out there. Where do you take the decades part from?