It is indeed just wonderful that people with genuine problems who need to restrict certain foods now have far more choice. Two of my cousins growing up in the  West of Ireland in the '60s and '70s were celiac - very hard work for their mother, living in a small farming community, to keep a gluten free diet going, while raising a large family and running a farm. Things are definitely much better now. As you've spotted, my concern is about the huge amount of dubious advice out there, from people who claim to able to diagnose allergy and intolerance using methods which are not validated by any regulatory body. Keep up the good work!