The reason that USSR looks good in metrics is because it was a unified nation with clear goals and everyone was forced to contribute towards those goals. And out of necessity the government provided the bare minimums that a person would need to continue to contribute to that whole. But there was absolutely no choice.
So, obviously once that rigid system is torn down, and people no longer have that access to necessities, things get worse. It’s just wrong to thing that going back is the right direction to go.