Honestly I've heard this idea rephrased by many different people, but I think it's unexamined. If someone interrupts me from a complex train of thought, after, it only takes a few seconds of minor confusion before I can get back to where I was - and I doubt I'm unique this way.

I think we may mistake the annoying feeling of plummeting, from the lofty domain of engineering complex software into the banal, as a major loss of productivity. The feeling is very annoying. But does it take so long to get back into your dreams of that perfect ci/cd pipeline, or high throughput system? I'm not sure.