because it might become too cumbersome to implement it on pieces that have complications that will benefit from having a winder.
I'm almost of the opinion that a chronograph (ala moonwatch) would be the most "sensible" if you want to go complicated... and time only with seconds as perhaps the most elegant for manual wind.
Beyond it, we might be in "trouble". Besides, having a 2 day PR is enough. I think that was meant to be so that we can have regular contact without pieces