Well I'd suggest that by doing water changes you are reducing the amount of ammonia which also reduces the population of ammonia reducing bacteria (as there isn't as much ammonia to reduce to nitrite). So by doing water changes you would be stretching out your cycle, especially if you are constantly removing most of the ammonia/nitrite/nitrate.
However I would imagine that by doing water changes more critters would likely survive on your rock perhaps??
FWIW, I've only ever had cured rock so I very well could not know what I'm talking about. These are just my thoughts
