Quite a good survey, but lacking a couple of vital considerations such as:
- Age brackets don't allow for pilots over the age of 65
- Does not determine how recently respondents have been flying commercially
- Does not ask if the respondent's first language is English, and if not, what language.
The last is important because it would give some insight into the likely culture of the respondent. My unscientific observation is that certain cultures are more inclined to disregard instructions that counter common sense. E.g. my employer does not discourage manual flying, but even if they did, I would still do what I considered necessary to maintain a skill. I imagine that your average 30,000 hour pilot in the USA would take the same view.
Another culture could take such an instruction absolutely literally and never attempt to fly manually. Or maybe never accept a visual approach for fear of becoming unstable, or holding themselves open to 'loss of face' if they screwed it up.