It was always total nonsense bullshit. President N. H. Knorr wanted the j.w's to mimic the "standards" of Corporate America, which he thought was the thing that was the highest of standards. Hence the suits, corporate hairstyles etc etc.
This was indicative of his, and even the present G.B's, parochial view of things.
The world has moved on, about 20 years ago, and gone from long Hipster beards, back to stubble. It is noteworthy that Jesus melted into a crowd, and escaped being apprehended, by looking like every other Hip bloke of his day. J.W's I can pick out as "weirdos" even when driving through a Town far from home. Because of imposed, nonsense, bullshit, non-Biblical "standards".