Can patch rendering cause more problems than fix them?

[Dace]

Had the last 2 plasterers want to skip even patching certain areas, I asked why on earth and that's the answer I got. Does that make sense?

They just want to go over an area in a new layer of render, not even patching it. The argument was that the areas of render that are in ok keep could be damaged when attempting to patch the badly cracked spots.

 

[stevethespreader]

The only way the good render could be damaged is when they are taking the failed render off to patch it