I appreciate governments stepping in when it’s clearly needed but these people get paid a lot of money to get this stuff right. I see no good reason they couldn’t have implemented Do Not Track as the standard. Invasion of privacy should be opt-in, never opt-out, let alone some tedious task where you have to manually tick every box along the way.
Most browsers have some amount of settings for forcing sites to request permissions like geolocation anyway so there’s little reason to have a borderline EULA to go through before someone can access a website. As for dark/light mode, the implementation on the web of dark modes is so all over the place that I - like many others - just use an extension to force it. It’s not native, it’s not perfect but it’s better than nothing and better than some official attempts.