I'm really quite confused as to why people think it's ok for me to keep someone I have on my block list out of their instance in a mode that claims to offer a real chance at encountering all other players in the same Open Play mode.
You block me, or vice versa, and not only will we not likely be put together, we won't be placed with in the same instance as each other. If there are two dozen people in my instance, and some of them might have fun interacting with you, what right do I have to impose my arbitrary exclusion on them?
If you had a neighbor who didn't like visitors, would you be ok with that neighbor cordoning off your whole street? Would everyone else on your street be fine with that?
I doubt they've considered all the potential downsides, unless the idea is to gradually dismantle the Open Play mode piecemeal.
Hardly! if there were lists of known EveilDoer to subscribe to for the blocking list, I will stop my boycotting of Open and come to Open to play. Those lists could be based on the Karma to be designed and implemented. Kill too many in LHS 3447? You get to be put on a SealClubber list and all new players get automatic subscription to that list, say until they leave 40 Lys radius.
Moreover, if everybody blocks you by some subscription, you will be utterly alone in a popularly voted shadow hell by your lonesome, and your wingmen. Nobody will miss your instance.
The thing is that the griefers worry too much. In theory, player police works fine. But in practice it rarely work out well. Because there is a huge disparity between the EveilDoers and the Cops. The EveilDoers get to choose the time and place for engagement, but the cops have to guard everywhere 24/7. In Elite Dangerous like game with huge number of places at huge distance, it's impossible to guard everywhere and provide timely response. It's like in a dog fight, the guy who got the better power/weight ratio gets to choose the engagement. The fight turns against you? Afterburner out, and come back on a more favorite terms. Moreover, the DveilDoers usually have the deviant determination on their side more than the what the 24/7 guard duty could wear out your average Johnny DoGood.
But, block lists, particularly with subscription and Karma combination, you better pray FDev does not implement this. You could be in popularly voted shadow hell without knowing.