Not what Buffs said at all. The ranges are big but its the averages that are compared over a period of sampling. The difference between 5* & 6* (unallocated) and 5* & 6* (allocated) are, for me, after 20+ x each training type on hard intensity, consistently producing a significant reduction.
%age change from previous star = 78/78/83
%age change from previous star = 79/77/76
%age change from previous star = 69/80/77
%age change from previous star = 74/75/74
You might not detect it from 1 individual result to another but you will see it on the averages of decent sized samples.