When a local friend of mine first aquascaped his tank he accidentally dropped a rock from a short height and chipped the bottom glass. I believe that if there was egg crate in place (or a sheet of acrylic if you don't like egg crate) it would have better dispersed the impact and prevented the chip/crack. To be on the safe side he siliconed a piece of glass over the damaged area and so far there have been no issues in the 6 years that the tank has been running.
I personally don't have any in mine but the next time I have to empty it out to move it I will put of a sheet of acrylic in place. My eel occasionally likes to knock things over so it will help me sleep better at night.
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