Bert
Although Chesty said "Jack stall ..... I think you call it" he asked about a helicopter reaching "an airspeed at which your rearward moving blade doesn't have enough speed to generate lift."
B73
We're all entitled to our views. Mine is that there numerous people here who can properly be called experts. Some are world-renowned test pilots, others are less well-known but also experts. The amount of expertise and experience never ceases to amaze me. Thankfully, we don't have many "self-appointed 'experts' on this forum." Even genuine experts disagree occasionally.