Here's a real life car analogy... GM in the 80's "unified" all their drivetrains.
It wasn't just GM. Everyone who hadn't already done this (that is, everyone but the Japanese) did this in the 1980s. It is in fact the general trend for all automakers. VW Group exemplifies this tendency today. The 350 chevy continued to be a highly desirable powerplant for pretty much all purposes right through the 1980s, and up until they developed its successor, the LS1.
GM cars from the 80's are considered to be the worst built and least desirable of the company's history. You don't see any of those models still driving around with classic plates on them.
That has nothing to do with the engines, which for the most part were the same engines from the prior decade, and everything to do with American producers trying to compete on cost with the Japanese.