Not wrong in the EU, you don't need to ask for consent nor notify about cookies which are required to make the site functional. Tracking and ads don't fall under that though, which is why every site these days does need to ask for your consent.

No, you need to always ask for consent for cookies if they come from a third party, regardless if they are only required to enable functionality. You also need to ask for consent each time data leaves the website (for example when loading an image from a third party host). You can't even load a font file from a third party server because the users IP reaches that server without consent. Cookie banners don't just handle third party tracking cookies, the are needed to record consent for a huge variety of cases. "Banning tracking cookies" does not remove the need for cookie banners.