The camp corsa I've found is actually really sturdy, I've abused it somewhat (used it to pry firewood from logs, pry rocks out of campsites, kill zombies, etc) and it's held up great.
The adze is certainly small, so if you had to chop a bunch of steps it would be cumbersome. But for the PCT it should be just fine.
Btw, most of the time it's used like a walking stick, so make sure to get one long enough.
Someone here on the forum suggested that when in your hand, the spike should just barely miss the ground. For me that's the 10cm camp corsa...which has served me well. :)
btw, for foot traction, I like microspikes for pct passes. Yaktrax aren't aggressive enough and break easy, and other instep 4 point crampons just make me trip all over the place.
Bummer is that between microspikes and the camp corsa, it's 24 oz on your back. bleh.