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Some pictures have computer screens on them, one even has relatively modern tft monitors, which looks weird combined with the 50s atomic tech. It would not surprise me if these control rooms have never been updated and are still looking like this.

You mean replaced with some WP based site for the fist hacker to play with?

There was purported present-day footage on tiktok of the control room of the Zaporizhzhia nuclear power plant in Ukraine that has just been captured by Russian forces. It looks like this.

They likely have computers in there now, but why mess with what works?

All components eventually fail. To maintain a system operational, one needs to be able to fix or replace failed components. Replacing a high-tech component made 50+ years ago (like a vacuum tube) can be prohibitively expensive even for military.

At some point, it becomes cost efficient to replace the complete system, or at least large components, with modern equivalents.

So that some manager can claim an "improvement" and get promoted