Dont think I would change anything on my Beaver Mill or Computurn Lathe but if I was doing the Bridgeport again it would be with AC Servos like the others.
Would still go with the SmoothStepper unless a newer version of it was out, then I would likely choose that.
Never had any issues with any of the electronics I have, PMDX 122 breakouts seem rock solid, DL-06 PLCs are the same.
Oh there is one thing I would change on the lathe, and will be doing it at some point, it is change out the panel switches for better quality ones. Only problem is the ones I like are £20 each so gets kind of expensive when you have 12 or more, will just wait until I find some on eBay

Hood