Fault? What are you talking about?
Small males are physically superior to large ones in industrial environments. Sadly I'm not small enough.
We will genetically modify humanity so that women will be tall, like 6'5", with huge hips and big wombs, who naturally superovulate and produce small litters of offspring per pregnancy.
Men will be very small, like ~3'5", but completely proportional and really athletic, and super cute. Their bones will be quite a bit denser than modern human bones and they will have really fast reaction speeds. In this way they will be vastly superior to modern males in combat and labor while costing far fewer resources.
All of them, women and men, will be very intelligent.
We already know how to use the Y chromosome to affect LRP5 so that it produces slightly more PTH so that we can make the bones slightly denser. Changing the size of the skeleton between the sexes is being finalized. Causing natural superovulation is known and can be programmed. The musculature for speed and agility is being worked on as well, and will be complete probably in a few years.
Everything is going well and will be done in like 3 years, maybe 4. From there modifying the germline en masse will be cheap.
There will only be small males and giant females being born in a few years.