jws are required to believe the current official doctrine, The official stance can lead to reversals of the "truth" taught. see the tacking sailboat illustrating by the wt writer Karl. Klein. and
as an example the wt understanding of the superior Authorities. Reversing course against the teaching of the prevailing wind, "pneuma" aka H. S.
This is unlike the scientific process, wt does not propose theories that can make valid predictions, that can be, and are falsified, again and gain. Not theories, edicts with the death penalty attached.