Finally someone who knows this! Even (some) "SEO advice" blogs have suggested to just use local storage instead of cookies.

Just no.

Both the e-privacy directive and the GDPR are very broad in their articulation and never mention specific technique's, technologies or anything like that. A good example is gdpr article 32.

Fun fact: the e privacy directive (which defines the cookie rules) isn't actually passed yet and technically you don't need cookie banners how they are now. Purely informational banners would be enough, but the directive already _should_ have passed but was delayed, and since gdpr spooked everyone, everything and everyone is using cookie banners now anyway