Maths 101: Precision and rounding.
73.5 when converted to nearest integer is 74.
74.4 when converted to nearest integer is 74.
One ratings could have a potential range of 0.9 of 1 rating point, so a player could hit those points and not see a point increase.
74.4 when converted to nearest integer is 74.
74.5 when converted to nearest integer is 75.
Range 0.1, creates a rating point increase of 1. Which development would you prefer to receive?