I question the purpose of some Internet websites which include the present. As a now returning student of physics, admittedly with slower or less remembered skills, I find that the answers offered are most often expressed in the most elegant terms, using techniques of the greatest generality.
Though this practice provides a means for the respondent to make his (or her) erudition plain for all to see, it is not in my view the best teaching practice.
Far more helpful would be to offer answers that use methods that are close to the accomplishments, as may be surmised, of the person asking the question. This would be far more helpful than answers that provide a stage for the respondent to show his/her learning.