I get this may be transpiled to the web, but...
My hunch is that it's partially driven by mourning over increasing loss of deterministic "von Neumann computing"; so not pure nostalgia.
It doesn't matter the platform or if "only" in software / web or whatever it's just a great hobby to dabble with in general, especially when kids are getting into it.
The ZX Spectrum Next, Commodore 64 Ultimate and the likes, same as their OG versions are still great "bicycles for the mind" and a great intro to microcontrollers etc.
I'd personally be ready for an FPGA based "Mega Atari 800" or some such!
Personally, I don't do much nostalgia. I've built the PDP-11 clones and run v6 Unix again and (o dear lord) compiled world.c with BDS-C on CP/M and realized that the 70s and 80s kinda sucked, and that I really like modern computing