(Also disable 3rd party cookies in your browser settings while you're at it)
Imagine that, by clicking "I accept", I agree to get my browser's fingerprint stored in their servers to identify me. For the sake of GDPR compliance, I can go back to their site at any time, revoke this consent, and they would actually forget me (crazy, I know).
The problem is: since I have already agreed to the tracking, I won't see the "Accept" button anymore. Sure, I can go there and revoke my consent, but why would I? I don't even remember going there the first time.
Agreeing to something I don't _really_ agree to is a bad idea overall. A better alternative, I think, is to start accessing cached versions of websites.
Cookies are but one method of tracking, so even if cookies are deleted the site may still successfully and thus lawfully track you through other means.