I think that part of the problem is that often the staff only know about what they stock (and sometimes not much about that) So you go into a shop with a ventile jacket on and many have no idea and automatically assume that the jacket is substandard to theirs due to it being cotton, often not a well known brand etc etc
You even get that with the likes of Paramo and buffalo gear sometimes, some people don't accept that they are 'as good' as other brands and products, I've had high position outdoor retailers explain to me that a paramo jacket isn't waterproof and only the likes of gortex is waterproof and breathable, I own a paramo and i know it's waterproof, it's just a different system to the one they favour.
really, unless we're standing naked we're using kit, no matter what it is, the old timers often used the most up to date kit they had, few looked at stuff and said, no, it's better that i do it the harder way. There does seem to be a mid way point where you've got the right amount of kit and you're completing the picture of what an outdoorsman should be rather than a tech'd up hiker but that's often decided by other that have issues with what they deem as too much kit and a betrayal of bushcraft and what it should be when in reality it's an opinion.
We as a species have always made kit, the best kit to suit our environment and the tasks at hand, to that end i'd say where what you want, take what you want and if you're more comfortable wearing the stuff you like rather than tech fabrics etc then do so, I love my ventile, it's not always the most appropriate but most of the time it's a fantastic bit of kit