I think in the context of this discussion the mods you are refering to are the exeption rather than the rule.Well, now that we are done trashing modifications, let's keep in mind that everything has it's place. Some mods are very beneficial for some people, (think older or disabled). For example: what's wrong with bigger, brighter, more easily visible sights for someone with eyesight problems??? What's wrong with different grips for someone with arthritis?? etc...........
I have a friend that is in a wheelchair, and some modifications enable my friend to shoot better from the very limiting confines of a wheelchair.
Training and practice are very important and, imho, should always be encouraged. Perhaps some mods could be used to compliment training and/or practice, instead of replacing training and/or practice?? (trying to be openminded)
To each his own. live and let live!