Well, he was going to use them to infiltrate the halls of power and take over all the world’s governments from within. Using them as a labor force was kinda like a tertiary benefit.
1) I will make robot girls because I can!
2) I now have semi-loyal robot girls, I will use them to take over the world!
3) I need more infrastructure before I take over the world. Wait I have robot girls who can help me build it!
We are now at stage 4, the infrastructure is built, and is self-building. Time to return to stage 2 and take over the world… with willing robot girls.
So that means Shiden’s androids are his human element in his ultimate automation scheme? o_o;