But I don't want to delete cookies? I want websites to use cookies that are technically necessary e.g. for keeping me logged in. I just don't want them to use it to track my behavior especially inter-website.

Interwebsite is solved by partitioning and login cookies are solved by explicit whitelisting.

You think the average user is going to explicitly whitelist? The law requires sites to whitelist their own cookies under penalty of law, instead.

> You think the average user is going to explicitly whitelist

When prompted by the browser on first login/signup, yes, the same way the password manager works. With stored passwords, keeping the login cookie doesn't even add much value.

What about the other 200 unskippable prompts you get just by opening the website?

Well, there is a skip button. It's labelled "accept all"