Sayas,
You are mistaken and misinformed, FACT. But, you're right saying that other "machines" can do just as good a job. I finish sanded my plinth and armboard today. By hand. With a block. Just for shits & grins, I pulled out the dial indicator and a surface plate (I know a little ((actually a lot)) more about manufacturing and tolerances than I let on) and decided to check the parallel surfaces. There is less than .010" difference across the plinth, on both sides. On the arm board there is less than .005". That just goes to show you that it is very possible to get the same finish in wood as you can in metal, or anything else. I could probably do less than .002" in metal, but like I said before, what for?
Patrick,
I agree after a little reflection, kinda. As an acoustic guitar player for about 30 years, I can tell you that string instruments most definitely react to temp & humidity changes. Acoustical instruments more so. This has a lot to do with the thinness of the wood, scalloped bracing, and the tension of the strings. Tonewoods react to these variables.
Besides, violins, guitars, cellos and other much more delicate wooden items have survived the test of time. These turntables will not experience the forces of a speaker cabinet and they are made out of much less substantial materials. Father time will be the ultimate judge on this issue and this thread will be long gone before the results are in.
Look at any pre 1950 Martin and you will see the effects of aging on a guitar. While it is true that forces that affect these other instruments and speakers do not affect a TT, the sealing with epoxy goes a long way in preventing this.
But I do agree with you re the wood platter. Like I said before, if Tom's Teres shows no ill effects from his rather drastic and repeated temp & humidity changes, I don't think anyone else out there even needs to worry about it, period!