This could avoid the problem of breeding cows to potentially inferior bulls if other farm chores overwhelm the breeding program. Dairymen can achieve the same benefit by selecting bulls themselves and preparing a list of matings. Evaluators can avoid matings between sires and cows with similar major weaknesses. Evaluators may have more knowledge of such weaknesses than some dairymen and can also deal with traits where an intermediate value is desirable. Rear leg set is an example.
Evaluators can frequently avoid the frustration of trying to use bulls in short semen supply.
Management tips are often offered by evaluators. Sire identification of offspring is encouraged, thus enhancing genetic evaluations. In some cases, evaluators use better bulls than dairymen would themselves. This benefit must be attributed to selection, however, and not to corrective mating. You should expect evaluators to use bulls that meet herd breeding objectives.