In my mind, it's never been a matter of 3D Printing not being fast enough for mass manufacture, but instead that it isn't suited for mass manufacture. That machine that just cranked out a gigantic batch of tiny simple products was one that wasn't being used to make the kind of big complex product that could bring in 5x the money in one sale.

What I'm saying is , sure you can use a printer to make the things you'd normally make in an injection molding machine... But why would you want to when you could be doing so much more?

It's like using a drill to hammer in nails when you have plenty of screws.
It's like being stranded on an island and using a perfectly good boat for shade.

I could go on... But I think the point is made enough already.