The view of (a)symmetry in an interview is very generational. Those who turned 20 in the 90s or earlier are more likely to feel the bottom side of asymmetry, while "Gen Y" or "Millennials" (for lack of better terms) are more likely to simultaneously be interviewing the company for fit with their ideals.
New (inexperienced) hires are also more likely to feel the bottom side of asymmetry, which can counteract the effect for the youngest.
So yes it is, and no it isn't, depending on the candidate and on the company.
And the field. My programming interviews felt surprisingly symmetrical. Every one of my friends who is in another field has far more asymmetry, just due to supply and demand.
New (inexperienced) hires are also more likely to feel the bottom side of asymmetry, which can counteract the effect for the youngest.
So yes it is, and no it isn't, depending on the candidate and on the company.