We all do that, but it might be both a strength and weakness of the forum inasmuch as strategies that suit us in particular circumstances are not consistently the best approaches across a broad range of circumstances.
For example, I prefer to use double socks, foot powder and prophylactic taping as the key elements of my blister prevention strategy. Double socks and taping appear to be strongly supported by research. Foot powder has limitations, inasmuch as it is only useful for reducing skin friction while it remains dry. If it becomes damp, it increases skin friction, and the attendant risk of blisters forming.
You seem to prefer an emollient preparation, which has different limitations and isn't recommended for all circumstances. I suspect that you will not let that stop you using it any more than I will stop using foot powder, because we both know the circumstances where our preferred approaches work for us as individuals.
In a similar vein, a few years ago the US military did a
systemic literature review on the prevention of physical training injuries in which they examined 40 different injury prevention strategies. They only found six that they considered were adequately enough supported by scientific evidence to recommend. Two of the proposed strategies were not recommended on the basis that there was evidence of harm, and 23 had insufficient evidence, and would need more research work before they could be recommended.
Similarly, it would be possible to take this advice completely out of context:
Applying this as the normal hand hygiene post toilet or prior to food preparation would, I suspect, markedly increase an individual's exposure to dangerous pathogens.
Getting back to the topic, other than the two sources I have already suggested, most of the research work that I have found in the public domain relates to the effects of skin hydration (ie skin dampness) on blister formation, and I have not been able to find anything so far that links dehydration generally with blister formation.