I think the debatable point here is that the lawsuit implies that the problem is that Google is not integrating analytics and Chrome enough. Analytics works in a certain way, and chrome works in another. The expectation that because both products belong to Google, they should treat each other in a special manner (i.e. Site-side Analytics should be behaving differently when encountering a chrome browser) is pretty iffy.

Every website does.

Not every website controls: the browser, analytics service across large part of the web, and sometimes the OS (Android/ChromeOS)

Your proposal is for Google to abuse its monopoly positions to provide a better privacy experience for its properties than for others?

Not my proposal. Regardless, a case is being made that Google is in a position to ensure its analytics services comply with the GDPR when a browser has been put into a mode clearly intended to opt out of tracking.

Other websites or services may be able to say they can't control how those browsers in such modes communicate that intent. Google cannot.