Not the quota - many places have quotas.
It's the fact that you now need to move along as part of a group rather than, say, being able to wait at one spot along the path for half an hour waiting for the right lighting conditions to appear, or for the clouds to move into a better position.
No real photography, no ability to wait for the best moments - just point and shoot when you get there, then move on and back to the bus, just like any othet tour group tourist.
Unless, I guess, you can find an independent guide, then pay them 16x the usual fee to go with you alone.