As the earlier answers have said, the probate calendar entries list the executors of the will, who are not necessarily beneficiaries.
Having names of non-relatives may be useful for your research as part of the study of a research subject's FAN Club (FAN = friends, associates, neighbors). See QuickLesson 11: Identity Problems & the FAN Principle on the Evidence Explained website for a case study.
"Professional" executors such as solicitors, bankers, and accountants may be less useful in determining identity than other acquaintances, but if a street address for the firm is given in the will, it is still interesting to see how far away the firm is from the deceased house, and to track whether other members of the family used the same firm. For researchers with troublesome "same name" problems, this kind of detail might help us separate people with the same names.