Indeed, the amazing images that we've all seen of the coronavirus are from the same technique, cryo-EM tomography, but the overall size of the specimen is also much smaller. There's a limit to how much data can be processed, resulting in a scale-resolution tradeoff.

Now my info might be outdated since it was a few years ago, but I was once told that when you use one of those microscopes, you bring with you a terabyte hard drive for each specimen.

Quite a few years ago, I was looking for a way to program microcontrollers via an onboard interpreted language, and happened on the picol code. I still have my version somewhere. It was delightfully straightforward and easy for an amateur to modify. So I first got it to compile on a Teensy, then added a REPL, floating point, and a few functions to do things like flip the GPIO bits and read the ADC.

Today of course there are things like CircuitPython, and I enjoy using it too, but it's such a beast that it's really impenetrable for someone at my skill level if I want to add low level functions.