Super Mario 64, widely recognized as one of the most iconic influential games ever... was released with a build that didn't have the compiler optimizations turned on. They proved this by decompiling it and with the exact right compiler and tools recompiling it with the non-optimized arguments. Recompiling with the optimizations turned on resulted in no problems and significant performance boosts.

One of the highest rated games ever released without devs turning on the "make it faster" button which would have required approximately zero effort and had zero downsides.

This kind of stuff happens because the end result A vs. B doesn't make that much of a difference.

And it's very hard to have a culture of quality that doesn't get overrun by zealots who will bankrupt you while they squeeze the last 0.001% of performance out of your product before releasing. It is very had to have a culture of quality that does the important things and doesn't do the unimportant ones.

The people who obsess with quality go bankrupt and the people who obsess with releasing make money. So that's what we get.

A very fine ability for evaluating quality mixed with pragmatic choice for what and when to spend time on it is rare.