Lee,
I was a professional journalist writing about tech for 20 years, and actually quite well paid by the hour for some of that time. In spite of my slipshod writing and uninspired style, I conducted a great number of interviews about computers and a few dozen about cameras.
In my experience, arranged interviews in the tech industry are a bit like football matches should be, a meeting is arranged, you shake hands, and you are allowed to kick the ball towards the goal, they are allowed to kick it back, after the match everyone goes home after shaking hands and a drink.
If you ask a question that seems to you to be a bit out of bounds, three things can occur. They can say excuse us we can't answer. Or they can say we can't answer that officially, but we would like it to be understood that. And it's up to you to convey this off the record information in some way if you so choose. Or sometimes they will surprise you and say "We are so glad you asked us that". But if you are doing your thing courteously and are known to abide by the rules, then just asking questions will never cause any issues.
My suggestion would be you simply ask questions rather than self-censor.
I could look at your reluctance to ask point by point. However let's just take the question "will your product survive a fall". What the interviewer knows about falls is immaterial, it's what the manufacturer answers that matters. A tech person could reply "everything can be damaged by a fall, but we rarely if ever see physical damage that can't be fixed on model XXX", and the PR or commercial person attending the interview can laugh and say "that's our tough-specced glass, did you see that test we participated in where they even used a shotgun on model XXX and it still worked". And they're then very happy if you repeat that, and it's a clear *hint* to the buyer that they'll stand behind model XXX not being coddled. They haven't replied directly to the question but they have provided useful buyer information in that they state they do have a really tough model.
Also, the service techs will often contribute provide unexpectedly useful insights into the product design. Like Canon service quietly explaining to me that some very expensive pro telephoto lenses have optically flat protection glass placed as frontal elements, and thus breaking a front element on a $5000 lens may seem a major breakage, but it can paradoxically be a non-event. This is not confidential information in any way, but it's not something put forward in the specs or by sales, and it's a very useful entirely positive piece of information to carry out of an interview. I suspect some manufacturers may have binocular models that have easy-swap or toughened ocular elements to solve the same problem of recurrent abuse in the field, just as some models have easy-swap eyecups, and given a chance the manufacturer might want it to be known that on those models a scratched ocular is a rarity or an easily done repair.
The results of this uncensored process may surprise you. I believe that some members of this forum may have seen birds they didn't expect to see, and felt happier for that.
I understand why you ask these questions Edmund and I might be able to obtain answers for some of them. However I suspect that some will not be answered in the way that you wish. For example service departments are not allowed to make statements about binocular performance. This is the remit of marketing departments in all companies.
For example: will the binos survive a fall? This depends on whether the fall is a few centimetres onto a cushion or from the top of the Tour Eiffel onto the pavement or, more realistically from half a metre onto soft mud or 2 metres onto rock. Even if you define the circumstances of the fall the outcome will depend on the position of the bino as it hits the surface and whether the fall was only propelled by gravity or if the bino had more speed behind the fall by for example swinging from the neck strap. It is impossible to answer this question.
Is is OK to clean with a sweater? I guess you mean the ocular and objective lenses and the only possible answer is no. You need to ensure there is no dust or dirt or other particles on the lens and on the cloth being used to clean the lens and with a sweater this cannot be guaranteed.
What tools and processes are use for collimation? This is regarded as confidential by most brands.
What to do if a member receives a new binocular and there is something wrong such as particles inside. The member should return these to the dealer and ask for binocular without this problem.
As for 'are the coatings resistant to pollution or do they tarnish, does the gas filling last or leak over the years (how many?) , do they need cleaning for internal haze periodically'. I will see if I can get answers to these questions and comments on the others.
Lee