The rubble at the bottom is an interesting example of how forcefully the rocks come down. They're piling up into a ridge, probably because they just keep tumbling until they smack into it and probably even get launched up it to make the higher parts.

This looks to be granite, which is pretty stable and climbable as far as rock faces go. So yes, rock sections do occasionally fall, even some really big ones, but not likely to be a problem during a climb, they happen more in the depth of winter and during storms. The small handholds and cracks will hold body weight and placed equipment will hold seriously long falls on them.

They are pretty stable granite faces as far as I know.

The main danger is ice/snow detaching and crashing down, which is why these are summer climbs. We watched (and heard) this happen while hanging out in one of the meadows, was awesome. Sounds like thunder.