vienne, American Adventism represented a push-back, a counter movement to the industrial age with science and reason elevated to new levels, with individualism hailed as superior to conformity.
IOW, overt mystical claims might be culturally less palatable, but the leaders must project divine providence and protection that convinces individuals to conform. It's a balancing act that results in cognitive dissonance among members when asked if their leadership is 'inspired'. Well, yes and no, they might want to reply.
The WT is a product of our culture and times as all successful religions are.