Microsoft has (according to uBlock Origin): bazaarvoice.com digitalrivercontent.net ensighten.com facebook.com gfx.ms liveperson.net onestore.ms optimizely.com pinterest.com twitter.com videochatmodule.com
If Apple succeeds without all that crap, the obvious question is why do so many other companies feel compelled to use it?
All requests to metrics.apple.com and securemetrics.apple.com are going directly to Adobe Analytics, a third party analytics provider and part of the larger Adobe Marketing Cloud. The only reason the requests appear as 1st-party is down to Apple going through a few relatively simple steps that most companies do to configure their DNS to route a certain sub-domain specific to their analytics to an Adobe server and completing a first-party ssl cert request/setup process. Once the data enters the Adobe Marketing Cloud, depending on their specific implementation, they can then link that data across all kinds of other Adobe Marketing Cloud platforms to both track and target your ass down to the millisecond like everyone else. Boom, you've been third-partied.
Adobe bought Demdex for fucks sake. 1st or 3rd party means jack shit these days.
And, yes, it degrades the user experience. Install ghostery to your browser and be amazed how much faster the web feels without trackers and ads. No wonder, a site like IKEA is running 31 different trackers. What's the use?
Apple does run Adobe's tracking software on some parts of their sites. But not much more. They already have server logs, why would they run external trackers anyway?
It's the same thing as an annoying Best Buy employee walking around while you shop in the store even if you have zero questions. Except in this case they then follow you around the rest of the internet. There is no reason for it and I'll pass.