Third-party cookies are a key technology supporting tracking networks, which have been identified as a major threat to privacy [CITATION NEEDED].
The latest draft of the planned update to the cookies spec has some notes on this.
It notably talks of 3PC has having "inherent privacy issues." You can also cite that section when you state that
In this context, many browsers are restricting or completely deprecating the use of of third-party cookies
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Cookies were originally designed for recognising repeat visitors to a website. They have since been repurposed
I wouldn't bother listing all the use cases for cookies, I think that's going to be a long list and it still