Probably because some of the east side crews tend to land on the runway and vacate (especially on 34) rather than vacating in the hover as the other two operators tend to do. Admittedly, the west side is easier to vacate with 32 available, and now 18 as well.
It is not a new comment, though, and it has been like this for years. Perhaps the east side operator has different checks/procedures compared to the others.