Not forgetting as much as a different and better riding suspension system (Torsion bars that run across the hull) favored flat bottoms and -- foolishly -- it was decided that the improved suspension merited taking a chance that land mines would be less used in the future. That didn't work out too well...
There was also the factor of increased interior roominess, important in peacetime, not so much in wartime, favoring the flat bottoms. As did production and maintenance costs, also a peacetime concern...
Still newer hydropneumatic and hydraulic suspensions will allow a return to sloped or rounded bottoms. Today's shallow 'V's work better than the old rounded hulls. Everything goes in cycles...
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