The point I was making is that the inference, from seeing examples of to worn gear to assuming rough handling is fallacious.
Inappropriate use usually leads to failure far before many signs of wear appear. The person who mistreats his tools is more likely to be seen with new tools, since they had to replace them, while the professional who takes care of his tools is most likely to be seen with worn tools, since they survived in his care long enough for wear marks to become obvious.
This is why I say you extracted the wrong lessons. System 1 thinking matches two intensities: wear and usage. The conclusion seems plausible but is wrong.
Professionals might appear to be unconcerned, but it's more likely the "making it look easy"-effect. The accumulation of decades of experience leads to a trained and steady hand, intimate knowledge of how fragile, grippy, heavy, etc. each part is, and an almost instinctive feeling of handling the tool as an extension of the human body. They won't drop the camera, but you might.