My comment is not predicated on any assumptions about a direction of change of anything, only on the fact that the warning is against a practice generally regar

My comment is not predicated on any assumptions about a direction of change of anything, only on the fact that the warning is against a practice generally regarded as harmful on entirely reasonable grounds, without any appeal to the spurious claim of your main clause. I may be mistaken in thinking your goal was sarcasm or ridicule, but if so, then I must admit that I have no idea what you are intending to say here.