Yeah, I was under the impression that tank "squeak" came from a combination of either "live" or "dead" return track and what sort of material was stuck in the wheels. Get mud/dust in the wheels and you'll get squeak.
As far as other things that might seem to be a show stopper....it all depends on the development of synthetics. Hydraulics, rubber...that sort of thing that might be able to have a synthetic alternative might be something that would qualify as a potential show-stopper.
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