Currently, there are inconsistencies in the tax treatment of different deferred plans, so for simplification of benefits, and the benefit of having a more coherent tax system, there are certain advantages to having one set of rules apply to everyone instead of a more piecemeal approach, but then also, there are gaps in the rules that could be exploited. We believe these would proactively prevent abuses in those two types of plans.
On November 2nd, 2017. See this statement in context.