Notes
The owner should still be on set
The standard advice is to work on the business, not in it. Build the system, hire the operators, remove yourself. I have read those books. I run three companies and I still direct every project myself, and it is a deliberate choice rather than a failure to delegate.
The advice is not wrong. It is just incomplete about which things you are removing yourself from.
Two kinds of work
Some work is repeatable. Invoicing, scheduling, file delivery, the checklist that gets a crew to a location on time. If you are still doing that personally after year three, you have a problem, and the fix really is to build the system and step back.
Other work is where the standard actually gets set. On a shoot that is the moment you decide the shot is not good enough and go again, with everyone tired and the light going. Nobody can inherit that judgement from a document. They learn it by watching someone make the call and seeing what happened next.
If the owner leaves the room where the standard is set, the standard does not hold. It drifts, slowly, in the direction of whatever is easiest to finish.
The test I use
Before I hand something off I ask one question. If this is done at eighty per cent, does the client notice, and do I care? If the answer to either is no, it should not be on my desk. If the answer to both is yes, it is mine, and no amount of scale changes that.
There is a second reason, less noble and just as real. Being on set is how I stay honest about what the work actually costs. It is very easy to quote a schedule from behind a desk that nobody could deliver. It is much harder to do that on a Tuesday when you are the one standing there at hour eleven.