[root_axis]

It's called a cookie banner because only people using cookies to track users need them. If you're using localstorage to track users, informed consent is still required, but nobody does that because cookies are superior for tracking purposes.

[madeofpalk]

> If you're using localstorage to track users [...] but nobody does

I promise you every adtech/surveillance js junk absolutely is dropping values into local storage you remember you.

[root_axis]

They are, but without cookies nearly all of the value disappears because there is no way to correlate sessions across domains. If commercesite.com and socialmediasite.com both host a tracking script from analytics.com that sets data in localstorage, there is no way to correlate a user visiting both sites with just the localstorage data alone - they need cookies to establish the connection between what appears to be two distinct users.