> Engineers spend decades designing an LCD with a wide viewing angle, and
> then a company sells you a device to narrow the viewing angle again. :-D
> How absurd.

Well it's not like the privacy filter is installed to all LCDs 
permanently, there are still many LCD applications where you 
specifically want a good wide viewing angle.  That's why a privacy 
filter is removable or electronically switchable.

A similar story with the anti reflective and anti-glare coatings that 
engineers spent a long time developing and perfecting.  Notice how you 
can still mostly watch an LCD TV even if you have a bright window 
directly in reflection - that would be almost impossible with CRT. 
However someone decided to then market a "glossy" LCD (which is actually 
simpler and cheaper to make) and many people prefer it.

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