Perhaps back in the days when we "enjoyed" tweaking our early Phantoms, it was useful to know subsystems like the ESCs. In fact, I recall seeing one YT video where a small fly worked itself inside the quadcopter arm and shorted out the ESC, causing what initially appeared to be a flyaway when crashing. But as systems mature, more and more subsystems are abstracted from users, gone are the days of adjusting our car's distributor "x" degrees before TDC, re-generating the CP/M operating system when adding a 8KB board, using a degausser on the magnetic head of our reel-to-reel recorders (or Phantom compass), etc.
And we can't even get "down and dirty" tweaking our beloved IMUs like the good ol' days - how dare they
Then again, even with cool new tools like image transmission setting readings, I doubt many of us are aware of external microwave propagation factors to consider when making adjustments, potentially the biggest risk mitigation factor to avoid aircraft but has never been discussed by the FAA, etc. But I'll be the first to admit when I point a finger at someone else, three more are point back at me!
