I don't know why you're being downvoted; you're absolutely correct. Or perhaps not "needed", but without cookies your experience on the web is going to be crap. Repeatedly entering your language preference, viewing first visit tutorials, ironically seeing the cookie banners on every visit (unless you block them), having to log back into sites like Amazon, Netflix and gmail on every visit, etc. etc. Cookies (or some form of local storage) are extremely useful.