Given the amount of fingerprinting and screwing with the content based on platform, I'd be happy to do away with user-agent completely. I'm tired of websites that are completely broken on mobile and force you to use the app (or constantly remind you about their app) and everybody returning a globally unique identification which is so hard to scrub.
Because for this specific bit of data, the value that it's set to by default has zero privacy impact whatsoever. So getting upset over nothing and yelling at a CEO who gave a great explanation of what's going on is incredibly counterproductive behavior.
Just like I think "User-Agent: curl/7.58.0" is a fine default.