The Wt reasoning simply does not satisfy. If God has delayed because he wants to prove that human efforts to govern are inferior, surely He should have provided some example of His magnanimous way of ruling to serve as the benchmark. The only example we have according to the bible story is the Kingdoms of Israel/Judah. Hardly a glowing success story!
It also is insisted that the 'end' has not come because he wanted humans to have achieved the 'height of their scientific achievements' so that they would have no claim to have been prematurely judged. What the heck does that mean? Humans are always improving upon their science and always will. This type of WT rhetoric is meaningless then.
It is also said that God allows humans to suffer to prove their loyalty to God under adversity. This circular reasoning should be obvious.
Also to say that God delays the 'end' so as to find more people who want to join Him is to suggest that noone would want to join God in an environment where God had removed suffering and evil.
A simple look at population growth stats reveals that by WT reasoning God is willing to kill 1,000 newborns for every new born who becomes a JW. The longer He delays therefore them more he is forced to kill.
Also they suggest that some angels might question whether God's human design was flawed and Adam was too weak to resist temptation. The WT themselves erased the force of this argument when they depict Jesus as Adam's equal but proving loyal. Therefore using the WT theology this excuse for delay became mute 2,000 years ago.
None of the "reasons" offered by the WT for God's permission of suffering (as they word it) in fact offer any reason, none of them have an objective in view, a teminus. Scientific knowledge will forever grow, people will forever be born. These very same flawed arguments could be made 5,000 years from now.