I agree. I'd really like to see an analysis of Android and ChromeOS. I'm glad to see Microsoft in the spotlight over tracking and analytics as this is a subject that gets far too little scrutiny from the tech community.
Tracking practices are widespread in the industry. Take Chromebooks for example, they are now used in many US schools. The kids have no choice in using these laptops, it's the adults who make the decision to deploy them (and Google that heavily promotes their use). The privacy implications of an OS that requires sign-in and then tracks every app and website you use are horrendous. Yet there's barely any scrutiny from the tech community.
We really need to apply this analysis of Windows 10 to other operating systems, especially ones that we know track you by default.