Take what Zenith has to say with a grain of salt. Great company, importer, and builder. MKE is also an exceptional manufacturer. The difficulty is import scheduling and Zenith having the confidence and capital to bring a $1500 5.56 roller delay in a market saturated with ultra-reliable $500 5.56 ARs.
Folks like you and I would eat a Z33 up in no time. I'm sure most in this forum would! But the general masses would be blissfully unaware.
I've heard this argument from folks at PTR as well.