The Soviets also made scientific breakthroughs within their military industrial complex. Not much of that trickled down to ordinary people, which then hindered it from being further applied.

The silver lining of concentration camps is the human experimentation which gave solid evidence for solid science.

How much of “solid science” are we talking about? My understanding is that it was not a lot, and its quality was rather poor.

I imagine that we would be more scientifically advanced

I highly doubt this. The fascist regimes are not really welcoming for open science having scientists with freedom of thought. The science would be more like in the Soviet Union, where science education was great, but the advances were reduced to “government approved” tracks like space, weapons and maybe some medicine. Hard to see something like computational revolution stemming from a repressed regime.