> qualifying all your statements makes it very hard for less technical people to work with you

I say tough shit, fire the less technical people, and do more with less. Qualifying your statements is absolutely vital to not being thrown under the bus by certain types of "bad leaders" who are smart despite being almost never right about anything. They know how to cover their ass and deflect blame. People who qualify what they say are the same people who write fewer bugs.

> do a high volume of work in a single area for a long time, so you gain deep familiarity

I agree that what matters most is having experience and most people don't seek it actively enough so we end up with this mess.