Your comment explains why students would like to receive these accommodations (it gives them a competitive edge), but does nothing to explain why this is logical or beneficial.

If as you say the number of available positions is constrained, this system does nothing to increase the supply of those positions. It also does nothing increase the likelihood that those positions are allocated to those with the greatest material need. This is Stanford; I am sure many of the disabled students at Stanford are in the 1%.

Even in the top 1% there’s a limited amount of positions. Everyone wants every advantage possible over everyone else. That is how the market is. Even for Stanford students there is a hierarchy.