If anyone from CF is here, could you please add a standard “X to close” button (reject all) at the top right?
The dark pattern you describe is shown in the first screenshot as an example of what not to do: they say it "can at best be frustrating to users and at worst draw enforcement actions from regulators in a number of jurisdictions", which is a nice way to say it's annoying and illegal.
(Disclaimer: I'm on the team behind this feature)
1. It's usually hard to find and to touch on a mobile device
2. Many websites use the dark pattern where clicking "X" is actually a way to give consent (or so they claim, as such "consent" is not valid under the GDPR rules). Due to that, many users are habitually confused about what will happen to their data choices if they press "X".
(Disclaimer: I'm on the team behind this feature)