Popa
You are not the first person Ive heard this “distinction” between a prenup and kesuba from.
A real distinction would be the nature of the people behind the two obviuosuly ORa or whomever cant be comapred to chazal.
I’m not sure what you mean by “overheard” Here is a factual example I personally heard from a prominent Rav, he mentioned during the brain-detah hulabaloo a few years back that no person who lacked pulse and wasnt breathing ever survives and thus “Cardiac death” is final as aopposed to brain death. I told him this is simply incorrect as CPR revives people from “cardiac Death” Literaly daily (more than that actualy) He refused to beleive me. I asked a friend who was in the shiur what he thought of that he said I cant argue with Daas Torah. I’m sorry but this is nonesense. If you’d like I can provide others but I dont want to hijack this thread more than I have.
DY
so if a few lines were added to the prenup regarding the marital obligations it would bethe same as a kesuba? That is easy to fix