[r0b1n]

It is hard to assess, so this is just speculation, but I would guess that it is far easier to keep a facility in good working order, shining, nice and presentable when you don't actually use it but just pretend.

Also, the Soviet Union as well as Russia do have a culture of corruption, plan-fulfillment-only-on-paper, diversion of public funds and organized inefficiency on the job. E.g. from the current Ukraine-Russian war, there are reports (to be taken with a grain of salt of course, but there are dozens of confirmed, similar stories from Soviet times) of food shipments containing just canned water instead of canned meat/vegetables because somebody embezzled the money and shipped water to cover it up. I can't really decide either way: maybe all this is even easier, given the secrecy surrounding everything military and nuclear. Yet maybe it is harder, given the increased scrutiny around all things nuclear.