I'm not sure if this is a fully dissenting opinion, but I have to disagree with you and dsio on this one. I think this is a pretty good idea. Comparing the PO crystal to a cell phone screen is not fair considering the thinness and the different makeup of said screens. Also, removing the outside anti glare / anti reflective coating WILL affect the proprieties. Maybe not greatly, but there will be an effect.
Sapphire is incredibly hard (9 on the Mohs scale, and just for reference diamond is 10) so dropping and chipping or cracking the crystal is not what these protectors are made for. They seem to expressly made for protecting the AR coating, which many have noted is much easier to scratch. And yes, while one can get the AR coating removed with only a slight degradation of the viewing capabilities, it does take time and money while also bringing down the value of the watch. For some it's just not practical.
To the OP azruski777, how much does the extra layer of plastic adversely effect the crystal? If it makes the crystal less transparent in any way maybe there's a better option like maybe paying that extra amount to either have the AR removed or even getting another sapphire crystal without the external AR coating and installing it while also keeping the original crystal in case of a sale.
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