Even for people who
do have this goal ("helping those who need it most") in mind, this reasoning doesn't make any sense.
There's only so much resources you can invest into a single person. Their time is limited, so if their leaning rate is slow, there's really nothing else that can be done beyond some point to speed it up. Forrest Gump will never be Stephen Hawking.
The reality is that this equity movement is motivated specifically by pushing down high-performers. They're removing (or wasting) resources just so that they don't get to the top 10-30%.