"your finger has to hit less keys"
Excuse me, but I use both my middle fingers to type. And that should read " *fewer* keys".
jk
Oops, I mean just kidding.
The trouble is, 'common usage' is going to win out over proper spelling, proper grammar, proper definition every time. A good example on this forum is that 'acute hepatitis' is now commonly used to refer to the period of time immediately following infection, even if asymptomatic.