I think the problem is that they try to have it both ways...
... The GB alone understands the deep things of God
... The GB alone has been chosen to speak for Jehovah
... The GB condemns all other religious organizations because they don't have the truth
... The GB demands that JWs order their lives around everything the GB teaches
... But the GB are just fallible men who have mistaken expectations so it's unfair to hold them accountable for their pronouncements...
If the GB has been hand selected by Jehovah - there shouldn't be any questions at all if they are in the Truth - not one of those noted accounts have solid scripture to support it. and if they were selected then by all means they should be held accountable for what they say.
Matthew 12:36-37-- 36 “But I tell you that every careless word that people speak, they shall give an accounting for it in the day of judgment.37 “For by your words you will be justified, and by your words you will be condemned.”
Didn't Jesus example God "Jehovah" his Father He only did what He saw the Father do and Said what the Father said? Hebrews 13: 7 Remember those who led you, who spoke the word of God to you; and considering the result of their conduct, imitate their faith.8 Jesus Christ is the same yesterday and today and forever.9 Do not be carried away by varied and strange teachings; for it is good for the heart to be strengthened by grace, not by foods, through which those who were so occupied were not benefited. - why would there be any changes? Gods not a liar -- Numbers 23: God is not a man, that he should lie; neither the son of man, that he should repent: has he said, and shall he not do it? or has he spoken, and shall he not make it good? xcross ref 2 Timothy 2:13 if we are faithless, he will remain faithful, for he cannot disown himself.
Hebrews 6:18 God did this so that, by two unchangeable things in which it is impossible for God to lie, we who have fled to take hold of the hope offered to us may be greatly encouraged.