"Limited in their materials" uhm your obviously behind the times [all3dp.com]
You got almost an unlimited list of a variety of materials to print on an FDM printer, and many machine shops are integrating 3D printing into their shops.

@HerrDarkAgain after reading through that page i still stand by my original statement. Yes there are ways to make parts from metals on lower end printers, but to actually achieve the strength of metal it has to have significant work following the print that bonds the metal together. Most parts could likely be printed or molded then cast with aluminum or iron faster. I think the technology has potential but subtractive manufacturing still makes more sense for most applications.

@Mechanic You do understand this is basically moldless casting right?
It is cheaper, just as reliable, and just as strong, The real plus is you can print internal passages.
Now instead of charging a customer $300 for 75-90% waste loss(casting 15-30% waste loss) material the shop can charge the customer $80 for the exact same part with under 3% waste loss.
Keep holding onto your belief instead of the facts, 3D printing will be as much a part of a machine shop as having a mill, a lathe, and a surface plate.