I've never understood why the user-agent string gives out so much system-specific information. Why not return less information, such as only the browser make and version?
It's unfortunate that browsers are privacy-insane by default. Luckily, with a bit of effort, most browsers [2] allow you to mitigate this with plugins (e.g. User-Agent switcher, Cookie/Referrer controller, and JS/Adblocker). Pi-Hole [3] can help too.
Mozilla should be commended for trying to improve the situation.
1. https://panopticlick.eff.org/
2. Chrome's days are numbered: https://news.ycombinator.com/item?id=18973477