Superblock payments
Thousands of users payments needing verified in a single block would potentially require greater compute time than a traditional block which only verifies a single user's POR rewards right?
Likewise, I'm not confident in such an approach given the recent superblock insecurity/instability, wasn't brod effectively able to force SBs to the rest of the network?
When no-one is running NN on testnet except you, sure you can force whatever SB you want. Sam with DWP. Participating in NN is important for this reason.