As far as the smartphone angle you mentioned, it makes for a decent analogy, but isn't entirely relevant unless I'm being too specific.

Computational power was never the problem getting to the moon. The analog computers were basically some op-amp circuits. I think they had a differentiator and an integrator. You don't need 4 modern cores running on Android or anything. In fact, simple is probably best and safest.

Overall, I'm just being nitpicky and fully agree with the rest in that space currently isn't worth the economic cost.