I suggested that but it was not well received unfortunately. I don't think Steem will ever adopt privacy features due to political objectives of Steemit.inc but I do think witnesses could be convinced someday perhaps.

I more importantly is whether or not Tauchain which seeks to build a decentralized social network makes the decision to have private computations or not. It's a very critical decision which will have to be made for any social network but particularly for Tauchain. I think Steem already made their decision and has to live with the open network and all the problems from that choice.