I think it teaches suffering is a virtue. God demands sacrifice that hurts.
This dovetails nicely in the call for simplifying (sacrifice) to give more money and time to the org.
It encourages giving up. Since life in this system will never be anything but tragedy and heartbreak (according to the messaging), just give this life to "Jehovah" aka the WTBTS, and earn your next life. You can live then with your resurrected family.
I see it as abusive. Beat down the friends emotionally and they can be more easily controlled.
Same line of reasoning as abusive husbands that "keep a woman barefoot and pregnant" and tell her she will never amount to anything.