"holds break, grade stays the same" -jack marshall NJC
I think we agree.. cleaning a route you will need to dig out some cracks, remove loose rock and i'm even ok with reinforcing holds that have the potential of breaking but are important to the route (if done well.. there are some hack jobs). sometimes holds break and you can't do anything about it.. easier harder depends how it goes. I don't agree with purposely altering a route, especially if it is to make it easier or harder or even existing. some rock can't be climbed yet.. leave it. V15 wasn't possible a few years ago.. now it is.
never been on Twilight zone.. over my head.