"Perfectly reasonable explanation" is not equal to "Apple asked for permission".
Nor is their any assurance that Apple meets perfectly reasonable security standards on the information transfer.
Exactly when and where does anonymizing take place. -If the results are to be useful to me personally, it sure can't be before it gets sent to Apple.
Just how easy is it for third parties to intercept and interpret these torrents of information?
If you look at the cookie at github for "About This Mac", it has OS version and Mac Model. None of those identify you, there is nothing about the user there. That cookie information gets passed to the Apple support site which in turn supplies you with the correct URL for you say your user manual. If they need serial number, they prompt because that does identify you.
The user is anonymized from the start, Apple doesn't tie these queries to email, IP address, or Apple ID.
I don't think I'll disable this, what am I really giving them, an ID which is a random number as far as I can tell, for 15 minutes, a search string and my location.
The value proposition is they give me the address, phone, URL, reviews and a map to the business I'm looking for in one quick query.
Of course you have to trust people a little, just like when you trust the 1000s of mail servers that store your email address, your hostname, the hosts you connected though, etc etc etc. every day.
Lastly asking for permission should be reserved for things that have sensitivity requiring it. If you nag people too much they'll learn to ignore you. I knew someone that forced the browser to request approval for every cookie, so they click yes every 5 minutes all day, to what end.