Totally inappropriate for desktop TV
Filthy greased up screen
Hands obscuring the view
These are inarguable facts.
There is almost nothing in favour of PC touch screens and, for a desktop, the concept is imbecilic.
A touch screen is convenient on tablets and phones, purely in order to minimise size and eliminate peripherals. But in every other way, a touch screen is seriously inferior to a separate keyboard and mouse.
And another thing - keyboard or mouse is a cinch to replace and costs very little.
Get a problem with your touch-screen and then what? Hmmm .. . not many people seem to think of that!
Touch screens on PCs are a stupid gimmick that will eventually be abandoned as people slowly realise just how inappropriate it is.