watch winders and fully wound main spring..

[HAL330]

So it occurs to me (and I'm no watch maker, but I do hold a mechanical engineering degree) that keeping your watch wound all the time, either by winding it manually constantly or keeping it on a wonder so that the main spring is at max tension has to have a negative effect over time ... vs allowing it to wind down either partially or all the way to a stop and then winding and wearing it a week later (this assumes you're rotating watches and not wearing the same watch every day)..

Anyone ever do a study on this or has anyone finally decided whether watch winders can do more harm than good by both keeping the main string fully wound and / or not allowing the gear train to stop when not worn for a prolonged period of time and thus wearing down the gears faster for no reason?

Thoughts?