One has to account situation in USSR - while Stalin were alive, many areas in USSR seemed to be "developed", as if key person could roll out claim, then responsible person(-s) very quickly could get so called "free ticket to North" or maybe even worse (not so typical post war). And mind, who worked in factories then - people were hardened by war and knew value of job and taste of bread. Further-worse. Later USSR earned some money selling black gold, gas and war machines, people hadn't vision because of corrupt government and crazy ideology. So most worked not to create world's best camera but to earn bare minimum, trying to steal something in working place to improve their living. Do you know about Soviet production and market ? If there were planned X cameras, then factory should make X cameras and not X-1000 - plan is plan and should be done, if you don't want problems. So you can imagine quality of cameras in those rush periods !
Btw in Soviet times there were myth told by factory workers - you didn't have to buy products made in certain periods. In January, when everyone were drunk after New Year. In last months of year, when workers work to complete plan. In summer workers try to sooner escape out of city etc.
Being working in last Soviet years, I know personally what chaos ruled then. Personally I made small garden tractor for my boss, out of factory's metal and using factory tools/electricity (I'm welder). He brought engine and we put it into. And this were smallest steal worker could do 🙂
My wife's mom worked in factory which made audio electronics. That factories made high class stuff for military industry and average crap for masses. She told me about how they forced workers to complete plan, imagine quality again, but then warranty departments had job - they fixed near new non working gadgets. Ha ha ha ! I remeber my first cassette player, 10 years old guy knew all about warranty issues. Best tape players were copied from Japanese makes, that's why now I buy Japanese cameras not Zenits. OK, Kiev 4 could be exception if I get it for good price - but only because Ruben's great evangelist work 🙂
Recently I asked known local camera repairer and he asked - do you really want Kiev ? Really ? He told that as Russians altered construction, they were far from what they should be, to mention just shutter laces - they are too thick, fraction of mm. And as years gone, construction and material diverged away from origin - Contax.