Umm. No?

I don't think you have a concept of how immensely more difficult it would have been to keep track of anything at all by that method. The USSR was never so awash in spare wealth and resources that they could afford to toss aside an accounting system that is quite easy to use for one that has a complexity that staggers the imagination.
It's not a case of choice, it's a case of necessity. If the USSR was a non-market economy, then they wouldn't have had a form of money in the first place, because money (as opposed to glorified tokens) is by definition something that exists in and circulates through a market. If it was just a set of tokens, then they would have ended up using material balance planning
anyway, because it would have been the only option available to them. (Von Mises, for all his faults, was quite aware of this, and made his critique of the "socialist commonwealth" on the assumption that this is how it would work.)
It doesn't work like a market because far too many of the decisions were made outside of trade.
How are decisions made "inside of trade"? You think the farmer doesn't plant a single onion until he has an order waiting for him? Planning exists in
every large enterprise, and necessarily so. As long as the actual system of distribution is one of commercial exchange, as was the case in the Soviet (albeit, again, submerged in the internal workings of the state), then it's a market.
I suppose you could call it a sliding scale rather than discrete points. But if you placed it on a sliding scale, it would be extremely far from anything recognized in the mixed economies as a market. Not to mention what the Austrian purists would say.
"Mixed economies"? You mean like, um, the Soviet Union, were 30% of the agricultural sector was private? Or Poland, where it was 79% private?
Probably not deterministic. But people who see themselves as prosperous and safe tend to look inward and focus largely on keeping what they have against competitors rather than being more outward focused on creating new and better. Pretty much all of the developed world's politics shows that.
So it's a case of subjective evaluation of well-being, rather than of material well-being
as such? Wouldn't that suggest that conservatism is perfectly palatable, provided that it's not understood as a threat to people's well-being, and that liberalism is entirely prone to generate socialism, if it's not understood to be sufficient in advancing people's material interests? This all seems to hinge on the presumption that conservative is always worse for people and is known to be people, and that liberalism is correspondingly better and is known to be better, which I can't say is entirely self-evident on either count.