I've told there's a new "guideline" for ice axe lengths. People are going to shorter ones, getting away from the; just touching or just above the ground with the arm straight. Anybody hear this?
I hadn't heard that myself, but am not surprised.
I've always felt that the length, like most things, is a compromise. If you want an axe for self-arrest and well as a probe, then that argues for a longer one as it will be better for a probe. If it's too long, it will tire your arm unnecessarily (been there, done that). If you doing some moderately steep stuff (not technical) a shorter one is easier to use as a climbing aid. Often it's used as a brake in glissading, so even if you go shorter, make sure it's long enough to go across your body as you don't want the pick directly in front of your abdomen or chest.
Or, simply get two. My first was a Grivel Pamir, an old standby, and a few years later got a BD Raven Pro because of the buzz even though it was 40% more. Guess which one I prefer?