Everything nondeterministic adds difficulty to the Scientific Method. Maybe we'll have better ways to filter the noise in the future, I certainly hope so, but that's not where we are now. But this is a little whataboutism.

Caches in the CPU or anywhere else are a leaky abstraction, and sometimes you learn more about a problem by having the abstraction, sometimes you learn more by not having it. Part of being on a growing project is that you get more opportunities to see both sides of a transition and learn from it.

When you have coworkers who clearly have only learned from one half of a timeline and have a great deal to learn about the other, wanting to put the brakes on and have them learn some discipline first is not a crime. Or rather it is, but it shouldn't be. It's like a weird version of Fake it Til You Make it that is verging on fraud. We'll keep up the fakery until someone notices and then we'll get a new job and reset the clock.