I suppose the principal "production enhancers" were:
only those parts of a piece that were on display were finished -- e.g. cabinet backs, the underside of drawer bottoms, cabinet insides were often left with an off-the saw finish, or scrub plane tracks.
master craftsmen and the journey men they employed used templates and story sticks to mark out components -- so no measuring was required.
a skilled craftsman can cut the tenons for M&T joints "off the saw". If you're making 20 to 30 M&Ts per day you'll get very good at it very quickly.
dovetails and other similar details were mostly spaced by eye rather than measurement.
the fineness of everyday pieces was much less than we think.
This is I think very relevant. Most of the furniture which has survived from 150+ years ago and is accessible for examination and copying is the higher quality pieces. The stuff which might be considered equivalent to today's mass market furniture has generally not survived.