This is indeed a very positive and smart move. Despite the fact that - a lot of sites just don't really play along (they'll just show you a nag popup that you have to OK, but they'll plant their tracking cookies before that anyway) - a lot of sites deliberately make it hard to opt out (this ranges from having to click around in the consent manager to outright sending you to a 20 page PDF that tells you that you can disable cookies in your browser if you want to - this, BTW, is clearly not an acceptable solution according to GDPR), don't show you the content if you don't accept all their tracking cookies (this is also illegal) - some sites just make it a bit harder than it could be (you can see the very same consent boxes on other sites with a more user friendly 'opt out all' option) - some sites do 100% OK

But it turns out that 100% OK is still not good enough. This whole thing should really be managed either by the browsers or by an extension and the consent request should come in a standard, machine digestable way (XML, json, what not). You could then just set your preferences once, that should work for most sites and every now and then (but less and less frequently) you'd be asked about what to do with unknown cookies on unknown sites.

In short, just because part of the industry is trying to circumvent regulation and because the current implementation is not the most efficient, we should not give up on the whole idea.