I'm going to take your lead and add a SPOILER WARNING as well.
The limits of the watch will continue to be explored through multiple endings. So far, every physical change has been controlled by the subconscious, like changing hormone levels to increase the size of the T&A and speeding up Haley's metabolism. In the next upcoming update there will be the option to command Ashley to shrink and make Leah grow. Whether or not that will happen remains to be seen.
Meanwhile, the mental limits are viewed differently from the MC to Laura. He generally thinks of his words as suggestions rather than commands and believes the limits to be softer. She believes that the watch is all-powerful. Both characters have seen evidence for their theories and we will continue to explore which character is ultimately right.