Why is there always a ****ing contest even when comparing R&D and cost difference between brands?

The B/RB engine is a 57 year old design, what has the Chrysler Corporation or an aftermarket company done in R&D to improve it in the last 25-30 years compared to the other two brands?
At this point unless you want to spend $$$$$$$$$$ on a Hemi the BBC is the next option if you want to make lots of power ... I even talked to a retired Chrysler engineer that made that claim.

I have no intention in switching brands, but i have the understanding of being at a disadvantage when it comes to performance parts, especially factory engineered parts.