I think that the issue is that now we mean "Full (Web-)Stack Developer" rather than "Full (Technology-)Stack Developer."

> And sometimes even hardware all the way to application level.

I don't understand what you mean, what is 'hardware' here?

Electronics, CPU, memory, assorted glue chips, IO chips, memory devices and so on. In the embedded computing world it is not rare at all to find a single guy that designs the hardware who programs it as well, from the ground up if need be.