The WTS says jws should not speculate about things the bible does not talk about; but the WTS/GB can do it (obviously they have a direct line to god).
Recently while saying jws should not speculate, the WTS rarely mentions current and past popular speculations by jws.
Just Reporting Not Supporting WTS views
SPECULATIONS COUNSEL BY WTS
1975
https://wol.jw.org/en/wol/d/r1/lp-e/1975446#h=25:0-27:123
As we look to the future we have many inviting prospects ahead of us. Therefore, we have no need to speculate about details that are not supplied by the Scriptures, but, rather, to be willing to wait upon Jehovah instead of fretting or becoming disturbed over such matters. Why speculate about who will be resurrected, how children will be cared for, what type of houses will be built, whether we will use machines, and suchlike questions. If we really needed to know these things, Jehovah would have provided the answers.
21 Rather than speculating on the unknown, how much better it is to concentrate on the thrilling things the Bible does say.
https://wol.jw.org/en/wol/d/r1/lp-e/1975644#h=24:290-24:662
Or we may find someone who is getting weak in faith, perhaps because of speculating about the future. There are some who are always asking questions that have no Scriptural answers, and, when elders or others in the congregation cannot answer their questions, they begin to doubt the fulfillment of prophecies or even to doubt that Jehovah is using his organization today.
https://wol.jw.org/en/wol/pc/r1/lp-e/1200027321/0/8
1962
Handling God’s Word of truth aright requires that we discern between profitable and unprofitable questions. Naturally we have questions about the past, present and future. In the Bible Jehovah has provided authentic answers to the questions that properly concern us at this time. Sometimes secular history can fill us in on details not given in the Bible. But there are other questions to which neither the Bible nor profane history provides an answer. It is not wise or safe for us to speculate about questions of that nature.
For example, in all good faith one might ask, What was Jehovah doing before he created Jesus, by whom he made all other things? If Adam and Eve had repented, would God have forgiven them? What happened to the bodies of those who perished in the Flood? Did the expensive gifts brought to the babe Jesus make Joseph and Mary rich for the rest of their lives? What did Jesus do between the ages of twelve and thirty besides his carpentering? How would Jehovah have redeemed the race if Jesus had not proved faithful? Exactly how long did Jesus’ trip to heaven take? Much time could be spent conjecturing on such matters.
Likewise it is possible to spend valuable time speculating on matters concerning the future. One might ask, In what year will Armageddon begin? Will the faithful angels eventually receive immortality? Will there be factories and machines in use after Armageddon? Will men wear beards again? What will be the medium of exchange in the new world? Will women now past the age of childbearing share in the procreation mandate? If dedicated parents and children happen to die before Armageddon, which parent will raise the resurrected children, since resurrected mates will not remarry? (Luke 20:35) These are typical questions to which Jehovah has not provided answers at this time. Do you think it wise for Christians to take time from more profitable Bible study to speculate on the answers? Consider the dangers involved.