It’s a scare tactic. These rules are really aimed at people Peter Thiel, in response to the pro public’s investigation - they don’t even hit other famous IRA (ab)users like Mitt Romney.
But getting you angry enough to defend his wealth is much more difficult than obscuring the fact that you won’t be affected by them, so we instead get vague and scary warnings about the bill.
They can easily stop the next Pete Thiel by capping the appreciated IRA balance which they have in fact added a provision for. I don't comprehend the scare tactic of killing the self-directed IRA.