Do you find it gross when there's a big stockpot simmering stock for 12 hours without a lid in order to reduce?
And what's to wash? You don't wash food after cooking, and pasta is like bread -- it certainly doesn't need washing beforehand either. It's just flour and some other ingredients.
It's not like vegetables where you need to wash off dirt, pesticides, etc. Or meat where you wash off bacteria. Those aren't issues with pasta.