Embedding user agent functionality into the OS is not the same as third party access.
Talk to me when a device manufacturer is caught exfiltrating this user data off the phone and then aim your pitchforks at them.
It actually is. Your monitor, on the other hand, can be considered a part of yourself for the purposes of viewing the data.
If it somehow sends sensitive information back to its manufacturer, thought, that would be a new, different can of worms.
Facebook never has any interaction with the human user, they only interact with the user agent.
Because they're not third parties. Third parties are anyone off the street that meets some minimal requirements. It's like the distinction between third party and second party releases on video game consoles. Second party releases are extensions of the first party publisher because of the special access and extra scrutiny they get. The difference in this case is that this "special access" is apparently no different than what you get from the website through scraping HTML, just in a more convenient manner.
But that doesn't make it OK for that data to be stored on the third party's servers or be otherwise available to the third party.