plinth for tts8000

  MDF is never the best choice for a TT plinth.

True!!!

But the Well tempered turntable sounded good!

Perhaps the WT turntable sounds good in your system. I have a history of finding fault with the WT tonearm. I won't reiterate here.

You found defects in the arm but it was not made of MDF, I was referring to the plinth. :)
That the turntable and the arm were built economically and in a completely unconventional way and against the rules of logic can be argued, but there is no product that is perfect and has no problems in its life of use.
So I wouldn't demonize it, otherwise there would be products to point the finger at even in the hi-end ... don't you think?