Japan would have in no position to remount the war in 20yr had a conditional surrender been accepted. By then, it was clear they had been in position to start it in the first place. With the southeast aisian old fields in allied hands, they could never have started again. So I don't think your attribution of a need for finality realy holds water.

I think the problem is with your notion of "total victory". If I may quote The Master: "Anciently, those skilled in war sought to take all under heaven intact."