3rd party analytics (eg Google) and non-tracking advertising are the grey-areas.
You ask why the fuss? That's why.
Most sites don't implement their own cross-site tracking, because most site owners don't control or influence large numbers of sites. Many sites use Google for adverts and analytics. It's the ambiguity over Google et al which is causing the concern.
That is all assuming the rest of what you say is actually how the law will be interpreted. This still has the capacity to become a weapon for those with wealth or power to use against websites they happen not to like.