Technically, but addictive in the same way working out, watching movies, or a book can be addictive. Basically it’s just your go to source for dopamine, but for the most part sources can be interchangeable. I.e someone who is addicted to gun could probably scratch that itch with a fps game or action movie (on a stimulus basis at least). This does differ from chemical addiction cause while the initial spark is from dopamine, the other chemical triggers makes it stick differently. If you are chemically addicted to nicotine for instance you ease it just from other stimuli, since it’s specifically the nicotine your body is missing.

Given what I’ve heard of most engineers, because we have software designed to solve all that stuff most of the stuff in class we don’t use ourselves lol. Though understanding the theory behind it still helps. Specially when something goes wrong you know what to look for.

It’s been awhile for me, not a control engineer but did my studies in mechanical engineering. So can’t speak for what you use in your day to day, but from what I remember controls (the math behind it) is tied with laplus transformation and the whole 1/t. Basically from those classes for feedback controls the zeros in laplus will say how it behaves in real life. And one way to avoid real zeros is forcing imaginary ones.

Imaginary numbers get like that. Since well most there uses are in higher maths.

For basics i is basically the square root of negative 1, this lets it do a couple useful things cause when dealing with control systems you can help avoid real zeros by tweaking the controls to create zeros at imaginary points ( which for a quadratic is always in a A +- root(B) form). So instead of stalling out it will occilate. For a simplified case, imaginary numbers let us make a cruise control that won’t just stop working on a highway.

I mean just like imperial, the units are based on SI which is mostly metric. Anything SI with distance can and is defined in meters. It’s just that using meters to convey such quickly gets messy since the universe isn’t going to make everything near round numbers. To give you a fermi approx of an AU, light takes 498 seconds to reach earth, light travels at 2.998x10^8 meters/second, therefore 1 AU is approximately 1.5x10^11 meters, that’s 150 gigameters, note the earth is only 40 mega meters even by the original meter definition.