Deer, like coyotes have proven to be very adaptable to their environment and is why they are thriving and can become a nuisance in suburban areas.

So are they tolerate of some human scent in certain situations/locations? Absolutely, but it doesn't necessarily mean that tolerance includes daytime movement.

Younger deer, yes, but I don't believe you can "train" deer,especially mature deer, to associate human scent with something good unless maybe in a park or similar environment where there has not been anything bad associated with humans for several generations of deer.

Mature deer, doe or buck, are extremely cautious by nature and I believe will ALWAYS react NEGATIVELY to the intrusion of human scent. They will go almost 100% nocturnal quickly, very quickly. They will avoid certain areas quickly, very quickly.

As far as trying to mask or eliminate scent in any effective way, I agree with you that it is an exercise in futility, but that doesn't mean I can get them used to my scent and become more tolerant by frequent trips to the woods. JMHO

The key is to get in and out of your hunting areas with as little disturbance as possible, to not leave more of a scent trail coming and going, and to be selective of when to hunt a particular stand.