So, real question, why does the tax code need to be -that- simple? Like, we've got computers and stuff to do the math these days? It sounds like an easy way to say that one is for 'a simple, common sense solution' while papering over the very real harm it's going to do to at-risk and impoverished communities.

To contribute, why should those communities that a flat tax harms be forced to bear that weight of simplification?

It looks like you'd be ignoring the reviewer's second point: that the other factor in societal collapse is when those portions of society that bear undue weight no longer can bear additional burdens.