I am really looking forward to HF20. Validation of genuine users is never easy and especially in the scale steemit is doing.

Paying mining time instead of steem will solve a few issues the current system has. Sure we have the same attack vector registering multiple accounts and flooding everything, but the mining is costly without rewards, so in my opinion this is a step away from abuse and to a better steem.

HF20 will also solve the case of fairly infrequent users who got undelegated after some time and then got locked out of the account.