Jesus’ body being taken down from the cross by people isn’t proof of resurrection though. There’s a lot of places jesus isn’t anymore, but the tomb is the one place he was supposed to remain. I assume every body that is crucified is taken down eventually (though I may be wrong about this- I’m not sure how weary people were about the public safety risks of a rotting body near society back then). I think the cross and crucifix are used symbolically over the tomb because Christians, to see themselves in Jesus, must pair themselves to the idea that they will be tortured for their beliefs.

Christians had a ton of symbolism to choose from (rainbow, fish, tomb, donkey, feet etc.) and they chose the one that will definitely give Jesus PTSD if he has a second coming.