You forget that after this "perfect" cylinder head is brought to market most of the people who made those suggestions will follow up with "it's too expensive" and never buy it. What good is an offset rocker cylinder head if it costs 50% more than everything else on the market and they sell 10 sets over 5 years? Great business model there.
If BP can "buy" each cylinder head for less than the current cylinder head they use on the Magnum based crate motors, and can use a less expensive (but still quality) valve train, they can offer their motors for less money. That's a win for the Mopar crowd in my book.
Is the TF head an offset rocker head? Do SB Chevy heads run offset rockers? LS?