In reply to ianstevens:
Probably just grade creep and the fact it has not been tamed by modern gear development.
I have only done it once ( 1978) and it did not seem especially hard, just middling extreme. But an historic on sight ascent for the early 50's!
Reasonable pro from the standard mid to late 70's rack of a set of hexes, couple of moacs, a few wires and lots of slings.
Kevin did mention a rockfall which might change everything.
Post edited at 13:13