Grappling hooks eventually break. Ladders and ropes can just be removed/reused. Plus, double grapple = I can’t build/chisel at the same time.
It’s not just for construction purposes, though. Sometimes I just don’t want to use a stairwell. Practicality.
Grapple hooks make for good bungee work, though. Latch to the edge, hang, fix, pull back up. You can only do one function at a time, though, because if you even so much as blink the wrong way, you drop the grapple.