@vikiv the problem is related to the fact that it is not possible to block cookies of others services because that services are served by other hosts/servers. Maybe I could block cookies served by my server (even if this could cause issues*), but I can not rule other servers.
* You should not block any cookies because there are technical cookies that are necessary to have things working!
For example, when you visit a site, the server that hosts that site outputs the page that contains a Youtube video; when your browser receives that page, it finds the external resource and requests it to the server that host Youtube site. It is your browser that connects to the server that hosts the external resource, so the server that hosts the original site can not do anything.
In this scenario, the only actor that could prevent cookies is the browser, as each resource pass through it.
In the situation of the preventive block of cookies there is a “little lie”: we can not block third party cookies. The only way to prevent cookies is to avoid the execution of services (that install cookies).
Owever, to be GDPR compliant, think that you should inform visitors of each use of their data and that visitors should accept those uses. Even if (for example) Analytics was not using cookies, you should inform visitors that you use Analytics for statistical purposes!
I think that if you do not want cookies, the only way to proceed is to find a service that do not use cookies.
PS: I mark the thread as solved as it is not a support or bug request, but feel free to enrich it! If we found a new idea, I will consider it for future implementation for sure! ??