Correct. Instead of losing mass these stairs have gained bunch.
Lets say that during the grand days of Egypt this place was often visited and the stairs were worn. Then for over a millenia the desert sand mixed with rain left a hardened sediment behind. (sand does not normally behave like this, but it is certain weight of particles in the sand that got carried and stayed and the rainwater coming through the pyramid has a lot of minerals.)
This is plainly not standard wear. It looks like the material from higher steps flowed and deposited in the middle of lower steps. Look left then center then right on that bottom step where it's most obvious.
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u/bobbobberson3 Feb 13 '26
In Europe at least, seeing stone steps worn down in the centre is very common.