As I’ve been telling the stories of the forgotten reactors, I’ve spent a fair amount of time pointing out what went wrong—the design choices, chemistry issues, operational blind spots, and institutional overconfidence that ultimately led many of these plants to shut down early.

To an outsider, that might sound overly critical.

So today, I want to say something clearly and without qualification:

Those early nuclear pioneers were damn good engineers.

These men and women designed, built, and operated nuclear power plants using tools that would feel almost primitive today—drafting tables, blueprints, slide rules, hand calculations, and physical intuition developed through experience rather than simulation.

No Monte Carlo codes.No digital twins.No CFD on demand.No instant iteration.

And yet they built reactors that worked—often on the first try.

They were inventing an entirely new industrial technology in real time, under immense political pressure, with incomplete data, and with the full knowledge that failure would be very public. That takes courage, creativity, and craftsmanship of the highest order.

When I’m critical of some of these early plants, it’s not because the engineers were careless or incompetent. It’s because they were pushing boundaries that had never been pushed before.

And here’s the part that matters today:

We now have the luxury of hindsight.

We know how chemistry quietly kills reliability. We know how small design compromises compound over decades. We know how “clever” solutions often age poorly. We know how operational realities punish theoretical elegance.

My concern isn’t that modern advanced reactor companies lack intelligence or good intentions. It’s that many may not fully understand—or fully respect—the specific reasons some of these earlier designs struggled, despite being built by extraordinarily capable people.

If we don’t internalize those lessons, we risk repeating them with far more sophisticated tools—and far more expensive consequences.

The goal isn’t to mock the past.

The goal is to honor it properly—by learning from it.

Some things were built better back then.

And with the right mindset, we can still do that.