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It is a proposal that could allow some from of one user one account type SMT.

I'd guess there are more challenges to integrating OUOA in SMT's than just within Steemit. I get the feeling Steemit is more a proof-of-concept for a community using the blockchain to incentivize behavior than an attempt to make it the best social platform possible so someone else doesn't make a better one and drain talent pool, wouldn't you think?

SMTs are going to open the doors for a lot of different variations to run on the Steem blockchain. There probably won’t be a one size fits all implementation.