The ethiopian snippet can have a very DIFFERENT meaning.....
James 1:5 - "If any one of you is lacking in wisdom, let him keep on asking God, for he gives generously to all and without reproaching; and it will be given him. But let him keep on asking in FAITH, NOT DOUBTING AT ALL, for he who doubts is like a wave of the sea driven by the wind and blown about. INFACT....Let NOT that man suppose that he will RECEIVE ANYTHING from Jehovah. "
Now, back to the ethiopian snippet, he had ZERO faith he could understand the prophecy without A MAN showing him! So....he was given 'milk'. That's why Paul asks when those in the congregation will stop being babes and take on whole spiritual food.
The GB twists that whole experience, to keep everyone on their milk for their whole lives. To never take personal responsibility for serving God, to excersise their own conscious and to make the truth their own, to prove for themselves if they will serve God as an adult, or if they will be as reckless kids who go crazy without the firm controlling rule of a human parent.
Ever notice how those in the WT, who had super strict parents, went crazy the day they hit 18 because they were not allowed to grow up? Same thing within the WT. Instead of going to the bible, on 'conscious' matters, it's lets see if it's in the WT, if not, then I can do it.