"Common sense" is a term that *this* hubber very strongly believes is fast becoming both a derisive and divisive term. As to the former, it's very easy to pat yourself on the back and tout th smarts you think got have that cannot be measured by your traditional, formal tests, often touted, ironically in a noncomplimentary way to shine a light on your alleged "street" or "practical" or "real life" knowledge or sense as specifically compared to an individual or group of people.
As a divisive term, it is particularly perilous and potentially mean, for it is both a real AND contrived distinction between those who "actually think before I do something" (note the prideful contempt intoned by the use of "actually", and those who "don't waste everybody's time fartin' around discussing stuff. I get it DONE instead". Note the latter's oozing contempt for what s/he is likely to regard with the broad brush of ostentatiously exaggerated, animated pride for his/her "practical attitude" or "efficiency.
The border - this divide or chasm which is only ever fed by one's proud, even snotty or contemptuous, hell, downright *militant* pride in identifying with one style/disposition or the other.
Unfortunately, the use of this term, almost by definition, depends on a favorable comparison to those who are more bookish, deep, or analytical.
Etymologically, at least in the relatively short-term cultural sense, it is a very short term, and thus sloppy and judgmental way to imply, or even state outright, what they who use that expression expect a "normal, responsible, regular person" who " has a good head on his/her shoulders.
This author thinks it is a fundamentally hurtful way to separate those of us who learn and think differently than "the majority", for a variety of reasons such as disability, geographically/culturally "foreign" background, TBI, PTSD,abuse, or evevn being raised by a grossly selfish and miserly parent(s) who saw their children as property to shape according to THdEIR (often ultra-orthodox, or creepily subservient) motives. Whatever the reason, good bad or neutral, is it likely a hurtful, and definitely inaccurate and insensitive term that outlived any proper use the moment after it was first used.