Many people are not bothered by WOW (or the "hunting" of various DD designs).
I generally find it to be more of a mild irritant than something actually heard as variations in pitch/tempo (we are talking decent decks here), which may explain why many are not affected by it.
I have not had this problem with any of my Thorens belt drives, but recall experiencing it with earlier Rega Belt drives (read they remedied the problem with later models) and most of the 70's/80's DD designs. It seemed that the DD's with complex speed control systems ended up being the worst offenders.
In this regard there is/was a killer vintage belt drive Sony deck that I would love to listen to again (if not own). It was highly praised for it S/N ratio, but I enjoyed it for its "kink free" sound. I'm not certain if it was a pro model, or not, as the only people I knew who owned them worked @ or owned radio stations and it was used primarily for transferring LP's to tape.
Unfortunately I can no longer remember the model number (knew it a few years ago:-).
Does anyone know about this deck (don't think that it came with an arm)?