Eggcrate Under Sand ?

[DiverDude]

I've used eggcrate under sand where live rock was located (to relieve and stress-points) in the past and had no issues but for a new tank I'm building, I'm contemplating putting a sheet of eggcrate covering the entire bottom of the tank to make changing aquascapes easier in the future.

I'm looking at about 1 - 1.5" of sand above the eggcrate.

Anyone have an opinion on why this may or may not be a good idea. The obvious concern is that it may impede sand dwellers, sand sifters and the like. Anyone done this and regretted it ?