It's unclear that the plastic screen shown should be described as "cosmetic only". The structure in front of the dome of present(past?)Axiom tweeters isn't just to protect the dome from damage, although it does significantly help accomplish that. It's a diffuser which promotes smoother and wider high frequency response.

It can't be seen in the picture if there's something else behind the screen to accomplish this. A comment from Axiom might be helpful.

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Enjoy the music, not the equipment.