Come the 80s, their manufacturing was well ahead of the west, and there weren’t any food issues either.

That's not true. While the USSR did have a significant manufacturing capacity, it was often inefficient due to the planned economy. This led to factories closing after 1991 because they couldn't compete with the free market. The quality of products was often subpar, and there was a lack of diversity and functionality. In fact, many essential items weren't even manufactured.

This was a major contributor to the Soviet Union's economic downfall and eventual collapse. If you read archival records (available through various books, for instance), you'll find that even high-ranking officials like ministers and vice ministers were writing letters to each other in the 80s about the poor output in their respective sectors, including the oil industry, which was struggling due to outdated technology.

In the USSR, higher education being free (as is the socialist tradition) gave people a lot more choice

The idea that the Soviet Union had exceptional higher education is a myth. In reality, their education system was overly focused on technical skills, neglecting essential life skills like critical thinking, creativity, decision-making, and many others.

This became apparent in the 90s when many supposedly 'highly educated' individuals were involved in fraudulent schemes, failed to build and stand for democracy. While it's true that the USSR produced some outstanding scientists, that's where the excellence ended. A society cannot thrive solely on the backs of scientists and enginners. A well-rounded education is essential for prosperity.