From The Oxford Dictionary:
com·mon sense
/ˌkämən ˈsens/
noun
good sense and sound judgment in practical matters.
"a common-sense approach"
Sorry Bill, but I don’t see anything about it being biased.
Although I agree with your posted definitions of
common sense to a degree, they are merely scraping the surface. A deeper investigation in regards the logic of the term is necessary.
I looked the term up a couple of years ago. I don't think I've used it myself since that time, and cringe a bit when others use it. I fall into the 'whatever that means' camp.
I find the following a fascinating study of the subject:
Common Sense
https://rationalwiki.org/wiki/Common_senseEDIT: 6:08pm EST
Additionally, I doubt whether the term would be allowed in formal debate