Currently someone could jump on the network with a big hashrate and gobble up 20 blocks until the difficulty goes up and then leave the other miners to struggle with the higher difficulty. Wash rinse repeat. right?
It could be a wise decision. Any drawbacks though?
Yeah that's the exact concern that I have. 20 block retargeting allows drop in miners to clean house and then leave smaller miners to pick up the pieces. As far as I know, there aren't any drawbacks to DGW3. If I can get everything up and going in time, I will release BTQ-r19 and have the DGW3 start at block 1,000,001.