I am not sure what would be a solution to improving the sign-up process both for steemit and for DApps that would not add an extra layer or introduce a new system. So I would not use that argument against it.
For me, having the ability to sign up a thousand users on my own every day without a significant cost is the most important change I need to work independently with Steem. It doesn't really matter much to me how it is done as long as there is some scarcity to it that gives DApps the incentive to give accounts to users who will actually add something of value rather than at will.