cognitively loaded

Forget monoliths vs. microservices. Cognitive load is what matters.

I do think many engineers forgot about "cognitive load".

There's also a difference of opinion if brining in a tool kit is more likely to reduce the cognitive load ("hey look, this does the work for us so we don't have to learn it!") or, thanks to the Law of Leaky Abstractions, increases it (we still have to know what the toolkit is doing, and how it's doing it, all the way down, in case something goes wrong.)

For the user experience too... stuff like Fitt's Law gets all the attention from the stopwatch brigade, because the millisecond increase is easy to measure - but stuff like cognitive load tends to be trickier to track.