My mother always used to say: "A bad workman always blames his tools"
Working as an engineer, I've often disagreed with that statement.
However, it does seem that for some guys, starting out with a sharp cutthroat razor, that this sometimes seems to be the case.
A cutthroat can be very unforgiving of poor technique, I suspect that for many of us, me included, that is one of the main reasons we use them.