I don't have a problem with SBD per se. Just that it should not be issued alongside (and at equal amounts, generally) to Steem.
I think derivatives should not be part of the monetary base of a blockchain currency, period. The reasons for SP are pretty simple and obvious, but SBD, it should be something you have to choose not something that is dished out every time you get a reward. This keeps the supply in a lock with the supply of Steem which means the fenced off area with wolves and sheeps. There should be a fence between Steem and SBD, or, you get what we see in the price chart.