I agreed with you 100%. Because this is a DIVERSITY VISA, VISA should be given at random order instead of whom can afford attorneys. The class action lawsuit should be a better format. But unlike other class actions lawsuit, the final order will result in monetary compensations/penalties to pay the legal fees. These DV related lawsuits' goals are receiving immigration visas. There is no money involved. In this scenario, the incentive for attorneys would be diminished, unless they want to do it pro bono. What's the correct answers, I don't know.
That being said, today's J. Mehta's Memorandum Opinion and Order is a great win for all DV2021 selectees, the legal war is not over yet, but it's a great win today.