ObeyGC2 does not merely offer people life after death, but also gives them a taste of life before death. It doesn’t only prepare them to die, but also teaches them how to live.
I’m not sure it’s possible “to be so heavenly minded that you are no earthly good.” At least not if you really understand what it means to be heavenly minded. That would mean seeing things as God sees them; caring about what He cares about; valuing what He values; loving the ones He loves. The fact of the matter is that God seems to care a great deal about the welfare of those who suffer.
Ex 22:21-23
21 “Do not mistreat an alien or oppress him, for you were aliens in Egypt.
22 Do not take advantage of a widow or an orphan. 23 If you do and they cry out to me, I will certainly hear their cry.”
John 10:10b
[Jesus said,] I have come that they may have life, and have it to the full.
Luke 18:29-30
29 “I tell you the truth,” Jesus said to them, “no one who has left home or wife or brothers or parents or children for the sake of the kingdom of God 30 will fail to receive many times as much in this age and, in the age to come, eternal life.”