Whereas you say: >Skipping ahead to the fact that automated data analysis is not prohibited per se, just needs to be reasonably targeted, the two most interesting paragraphs are the last ones for me.
I think this reads like the court curtailed reasonably broad data grabbing behaviors such as those Snowdon has revealed happened illegally and are still happening in the US. It still permits effective, focused/targeted data mining.
So at least the court learned from the Nazi/Stasi times but also from the times of left-wing terrorism ("Rasterfahndung" during the Bader-Meinhoff terrorist gang) - i.e., that these techniques are effective yet must not be applied to broadly. If this reading is correct (I'm not a legal expert), then the main danger is that lawmakers are incapable (or unwilling) to implement requirements (1.) and (2).