This question already has an answer here:
A lesson learned is knowledge or understanding gained by experience. The experience may be positive, as in a successful test or mission, or negative, as in a mishap or failure...A lesson must be significant in that it has a real or assumed impact on operations; valid in that is factually and technically correct; and applicable in that it identifies a specific design, process, or decision that reduces or eliminates the potential for failures and mishaps, or reinforces a positive result
I have noticed that my specific questions that are capped with a request for any lessons-learned are often met with resistance from moderators. The request for lessons-learned as it pertains to a specific topic / question is often used solicit relevant facts and answers to questions that one can not ask, unless one has experience. Why is there resistance to lessons-learned / experience? This is the only question with regard to this thread
For example, I might ask the question, when is the best time of year to visit the Paris' Arc De Triophe as a tourist? Any lessons learned are appreciated. The answer may be in November because that is when there are the fewest tourist and the companion lesson-learned is that the elevator is out-of-service for the next 6 months. So if you are go with your 70 year old mother mother, then you need to ensure that she is able and willing to walk up many flights of stairs and back down again. Maybe this is not the best example, there can be other permanent pitfalls / obstacles that can / should be avoided, but hopefully the gist is there.
The ability to ask a question and gain the knowledge-based experience is priceless. Not every question has a quantifiable answer that can be Googled and more often than not the original specific question needs to be refined through the lessons-learned mechanism. In every industry I have worked in, this is a common mechanism for learning.
That being said, I would (respectfully) suggest that the leadership at stackexchange re-examine policy / culture with regard to lessons-learned. From my observations: it seems that there too many that are too quick to unnecessarily police (censor) questions, instead of providing useful insight.
I do not believe that incentive (points) should be awarded for modifying / correcting questions and that question moderators should be those that have a history of providing accepted answers and not necessarily points (i.e. credibility)