Precisely. Not everyone is buried now, and then if they are, not in the same style/type of casket. Far too many variables insofar as the material used, imho. Joseph of Arimathea (sp?) was a wealthy man, iirc, and could have provided really high-end shroud material as well as the tomb.
I think the claim is that the shroud of Turin is woven in a way that was not known until around one thousand AD. If that could be proven it would mean that the shroud MUST be a fake. There may have been varying forms of textiles two thousand years ago but the selection would have been extremely limited compared to today, it wouldn’t have been simply a matter of having money.