You've got to start with the practical fact that the drivers are beryllium, and therefore there's got to be something in front of them that in theory not even the tiniest of pinkie fingers can fit through. What that something is, and how it's designed, and whether it really has a positive acoustic effect, or the company has to justify it somehow---that's far beyond my ken.
Paradigm Persona series
I'm beginning to poke around and gather opinions and information about a "super speaker" to replace my aging Thiel 2.4s. I like the idea of bass dsp room correction and I am a bit of a point source type imaging nut (thus the Thiels). So among other choices I've been looking at the Paradigm Persona series specifically the powered 9H with room correction for the bass. However I'm skeptical of the "lenses" i.e. pierced metal covers on the midrange and tweeter specifically because of Paradigm's claim that such screens "screen out" "out of phase" musical information. The technology in the design seems superlative but I just can't get past the claim re out of phase information and the midrange and tweeter covers. What could possibly be the science behind this claim? It just seems like its putting a halloween moustache on the mona lisa given the fact that the company is generally a technology driven company.