Facial hair on JW men is suspect, and has been looked down on since Joe Rutherford held the WTS presidency.
Much depends on who you are and where you live, and whether you can come up with some medical excuse for not shaving. As a JW, you would always be a bit guarded and distrustful of anyone with facial hair who goes to the KH.
Facial hair breaks the spell that keeps JWs as subserviently immature drones suppressed through hierarchical domination.
Amended to add that this was a very Roman Catholic clerical custom.