Peter wrote:

But this is a recent development; more than 10-20 years ago "GPWS" was
basically just a radar altimeter. I've read a fair few crash reports;
the one on Mt Erebus comes to mind in this context, c. 1985.

GPWS was mandated in 1975, shortly after the TWA 514 crash.

It was installed within a couple of years, so it became common 30 years ago.

EGPWS became effective about 10 years ago.