Do JW members follow any directive from GB blindly?
Many do.
Some don't do blindly, but coerced or by feeling obligated for feeling too invested in that organization, so they feel trapped.
Some follow out of pressure from family.
Some truly believe that going against a believe will have horrible consequences.
Some follow not necessarily blindly, but just because they don't want to think or decide for themselves.
Some do out of pride or fear of embarrassment.
Some don't follow and get away with it, convincing others that there some kind of biblical reason for them to be the exception.
Some don't follow and hide or live a double life.
Some don't follow and leave or are shunned.