That's true. Although for cookies, there's option to choose "X", "Reject all", "Accept minimum" or similar lines which i automatically choose these days.
Unfortunately the reject all option doesn't reject all cookies at all sites. There are usually mandatory ones that you have to accept and which you can't reject even if the site offers you the reject all option. The reject all is for the optional cookies. Maybe tools like the
Cookie-Editor can help to clear even the mandatory ones with the click of a button after you are done with a particular website. Manual deletion from the settings menu works as well, but both options first include accepting some and then deleting them afterwards.
Advanced users might get rid of the cookies popup using inspect element, but popular sites have protection in place against that. It works sometimes.