B&M flex plate

I get cost, but were 318 cranks all forged? I understand longer throw & bigger pistons, but it would seem you could cast in more weight where needed. It obviously wouldn’t have needed to be that much, if a weight within the 7” diameter of a balancer and a notch out of a sheet metal flexplate were enough to take care of the job, vs building, storing, & inventorying a completely different set of parts when you already have parts for the internal balance 318/5.2.
Obviously Chrysler employed more knowledgeable people than myself, but it just SEEMS like parts consolidation would have been more productive overall. Heck, you can put S-10 wheels on a corvette if to want, but you can’t put Dakota wheels on a Ram even