Brother?/Sister? Mirch I didn't say that their graves are preserved! But their bodies! This is confirmed by the sound hadith.
Some of the recent Prophets' graves are known in Palestine.
The graves of other 123990+ are known only to Allah (swt) - leave alone their graves we don't even know of their names or whereabouts to be exact.
That's what I had said:
I didn't mean to say that the Prophets (peace be upon them all) interact with the alive as if they were alive in this world.
It is your brother. Logic dictates if their bodies are preserved so should their graves be preserved too.
I agree that it does not matter if their bodies are graves are preserved or not . But a baseless statement can make some people leave the religion. Everybody is not at the highest level of Eman.