Earlier quoted context omitted.
I hate how web sites can weasel their way around consent by simply declaring their cookies as "necessary" or "mandatory." As the Dude would say: Yeah, well, that's just like, your opinion, man. How about we have an easy-to-use "Reject ALL cookies from this site (and deal with whatever breaks)" option?
There was the "Do Not Track" header, but I don't think any sites that actually honored it. And it is deprecated now. On Firefox we still have webRequestBlocking, so it is quite simple to block cookies. See for example https://addons.mozilla.org/en-US/firefox/addon/ximatrix/
Sites used that header to fingerprint and track users.