"""If Google wasn't sure, then it could simply refuse a request and thus bounce difficult requests to the relevant national data commissioner, who would decide."""
The problem with that was always going to be about cost and Google sent thousands of cases commissioners all across Europe, costs would quickly mount, google having to send lawyers to these cases costs of assembling their cases, writing up documents, potentially flying out witnesses even having to cover the claimant costs. Plus if discussions came out against Google it could leave google open to be sued for continue reputational damage, most costs.
An that one of the unintended side effects of the law that the stupid judges in Europe didn't think about, criminal cases often involve multiple people thus multiple people will often be mention in the article and would have their privacy violated, thus they have the right to remove the article, not just the criminal in the article. Stupid decision by a bunch of overzealous judges in Europe, it no wonder a large percentage of Brits want to leave Europe.
If people don't like the way Google is dealing with then they should campaign for the government to take on the costs of dealing with all the cases an the people who want that can pay extra taxes to pay for it.