Presumably God would have foreseen that the vagueness in the Bible about heaven and hell would lead to different interpretations and the arguments we see today about Infernalism, Annihalism and Universalism.
Did He have a good reason for keeping things so undefined?
Mark 4:11-12 seems to suggest so when it talks about why Jesus used parables:
11 And he said to them, “To you has been given the secret of the kingdom of God, but for those outside everything comes in parables, 12 in order that
‘they may indeed look but not perceive,
and may indeed hear but not understand;
so that they may not turn again and be forgiven.’ ”
Is it a deliberate ploy intended to make us reflect on these things as honestly as we can?
Or was it because that Jesus didn't want us to think too much about heaven and hell but instead to focus on living a Godly life while on earth?
Would it have been impossible for Him to have been clearer because our natural fear of the unknown, of "that undiscovered country from whose bourne no traveler returns" (Shakespeare), would have led us to interpret His words to conjure up the infernalist vision of something like ECT whatever He had said? The purpose of such a vision would be to justify and authenticate our fears to ourselves.
Or are there other reasons?
This is quite a gloomy topic but the the Good News is that God comes to find us in our misunderstanding and fear and brings us home. This is the universalist vision.