> If you have a law that would be impractical to enforce fully and in all cases because you'd end up penalising almost everyone it affects, it's a bad law.

I think this describes almost every law, not just speed limits and GDPR but also copyright violation and drug use and… well perhaps not literally every law, but enough of them.

> I don't believe we should legally prohibit normal behaviour for fallible humans, particularly if no real harm is caused and no ill intent was present.

I don’t believe this describes GDPR. First because websites don’t really need to grab analytics, because stuff you genuinely need to provide a service is explicitly exempt from the GDPR informed active consent requirement; second because website and app development isn’t normal behaviour for normal humans, it’s a profession; third because this data does cause harm.

Yes, there are all those risks you list from selective enforcement.