That is now the case in many of their doctrines. With blood, minor fractions are now allowed, vaccinations are o k and transplants are now a conscience matter.
Years ago they changed alternative service from a big no no to it could be alright now it's up to your conscience. Even voting I believe is fine now in many situations.
The generation doctrine has been changed gradually over the years and has been a great embarrasment to them.
Loads of dates have changed. As soon as one date was proved to be wrong they have changed it to something else.
Any normal org. would be very embarrased by all these changes but most times the WT gets away with it claiming it is new light from Jehovah. The rank and file are so indoctrinated that this is God's org. that they accept it unreservedly.