I don't know, it's stupid, you're right.

But so am I. A cookie banner is asking clearance to store stuff in your browser right now and it's always tracking shit. Most of those at the top would be covered by "essential cookies" which explicitly lists appearance preferences. For more advanced stuff, which is usually SPA territory, the app can ask for your clearance when it's necessary e.g. "Save your session in your browser for later?" rather than some generic cookie banner shite.