Is there a word or idiom to describe an attempt to win/uphold one side of a discussion (or somehow lessen the other's argument) by introducing some minute factual point?
The best example is when engineering discusses the best way to design something, and then someone offers "your idea is slower or inefficient" even though efficiency is kind of irrelevant in a lot of cases.
For instance an argument about the best design for a doorknob - a lever handle is a better design all around but one could say that it's less efficient or slower to open a lever door handle, than with a door knob. That ignores all the handicapped or elderly, children, etc anyone who might have a problem grasping and turning a round doorknob. Unfortunately in engineering, quite often performance is given more validity than it deserves and is mentioned in discussions way too often when it's not even relevant. You can't say that their point is not valid or should be ignored, but it's also at the very bottom of the list of things to be considered. At which point they will try to subjectively raise it up and remind you it holds validity in some way and shouldn't be disregarded.
I usually say it's splitting hairs or nitpicking but I wonder if there is a better idiom.