To what "obvious" are your making reference to, mister?
I thought this out ( yes, yes i do think...) and getting the end of the bohi end fixed by a well established togishi :
-wouldnt ruin the artistic value of the object, on the contrary,
-wouldnt modify that school characteristic of the blade, i dont remember seeing anywhere that "messy bohi end" was a part of the bizen tradition etc...,
-wouldnt prevent you from figuring when the blade was made.
IMHO this isnt a case of "preserving the aesthetism envisioned by the smith" like you can say when the kissaki tip is broken and you have to reshape it... since this was done wrong in the first place. Even if a mistake is 1000 years old, it still is a mistake.
Point take Mr Stuart, i just didnt realise this was acceptable, so to speak, i am just having a hard time beleiving that someone who can carve beautiful horimano cannot make the end of his bohi terminate smoothly.