Observation re gmail/google cookies

Is used to be such that only the mail.google.com:GX cookie was required to access webgmail (even if it added a number of other cookies post that access, they could be reasonably narrowed down and blocked to just mail.google.com, if I recall). Now within the past many months that has changed to include, at minimum, myriad cookies in google.com. (I've not tested which are the minimum set). These will potentially cross with ads and other tracking things. While great for google integration, it's bad for user privacy regarding domain/usage segregation. Do not trust the google in your browser anymore. As if, ever, obviously.