What you say is very true. On the other hand, our Lord Jesus didn’t even have a place to lay His head and died naked, hanging on a cross. Yet God raised Him above all.
Blessings can come either on this side or the other. But it’s a mistake to think they’ll come during this life.
Prosperity is needed to further the GOSPEL. Plus GOD delights in giving gifts to His children. It all comes down to the heart and motives, which GOD judges.
What you say is true.
But it has nothing to do with how the “prosperity gospel” is sold.
The prosperity gospel is sold as “blessings will come to you” if you “give to the lord” - which means give to the ministry selling that to you. It’s snake oil.