Not only is people different but what might be helpful for some, in others might create chronic issues.

Killing of species of your gut microbiome (by eliminating foods) should probably not be somethig to take lightly.

True. But I eliminate foods out of necessity. Recently I stopped eating legumes as part of FODMAP diet and I see it makes a difference. I also suspect that we may be eating too much variety. I like for instance Fukuoka's approach to diet http://criticality.org/four-types-diet-masanobu-fukuoka/