I get this in terms of MAP since in the late 90th percentile there seem to be no room and a lot of kids hit a raw score ceiling

But if I look at the PSAT design there seems to be a lot of room at the top (12 points for 95th percentile and 9 points for 99th percentile). Given that what additional information would the SAT provide if you are not at the 99+ percentile (<5 points away from the ceiling?)