You know, from a medical standpoint, it actually makes a little more sense to put an artificial womb in an android than it does to simply grow fetus jars en masse.
Sensor feedback between the mother and the offspring is vital for human development; You can't just assemble something in a petri dish and expect it turn out fine. As Armitage III best described: it takes more than just "plumbing" to make a person.
Theoretically, jars would be an ideal way of producing replacement organs for transplant, but if you're to create something that wasn't an unfeeling sack of meat, it would be ideal to cultivate in something that could feel, think and interact with the world on its own (or, at the very least, approximate characteristics).
The more you know.