When all you are is a hammer manufacturer, all your demos look like nails.

In which case the question gets inverted:

Why of all common things you could CT scan and show people, you choose something that is kinda obvious to anyone who has thought about it for five seconds? I don't think average people struggle to understand the concept of "electricity makes wire hot", especially if they lived at the same time as normal car cigarette lighter usage.

Lumafield posts tons of these. I don't think the average person has thought at all about how these work, and even if they do, the appeal of these is to look at the pretty pictures (and demonstrate the analysis that is possible non-destructively to their target audience), not to understand "electricity makes wire hot".

They have a scan of a dang football, and it isn't because people don't know there's air inside: https://www.lumafield.com/article/ct-big-game-football

Those who have thought about it for more than five seconds understand that there is more going on inside of a normal car cigarette lighter than "electricity makes wires hot."

It's a scanner company showing off their scanners, they don't sell bandsaws. :p

That said, it's a kind of marketing I like, since it does have some underlying product-performance and educational virtue to it.

Same reason every coding tutorial -- no matter the capabilities of the language -- starts with a simple "hello world".

Learn with a simple toy example before moving onto the industrial-grade deconstruction that really shows the power of the tool. These guys have done CT scans of things like real vs. fake airPods and charger bricks to show what really justifies their (probably) 7 or 8-figure price tags.

This one is just content marketing of something anyone can wrap their head around.

IR heat profile might have been cool.

It's a shame cars don't come with them anymore. A lighter can save someone's life and cost next to nothing. You can toss a lighter in but something about the designated electric plug is pleasing and invites you not to lose it.

Yes, very handy even for non-smokers. We have a 2015 vehicle that we bought used that came with a cigarette lighter. I removed it and put it in the glove box.