Interesting, I liked the first part of what you posted, then I hit this:
In our society even the wealthy are seldom caretaker of their own property as they rely on others in the overwhelming system of institutionalized stewardship we call wage earning or employment ... or simply jobs.
It's not that the boss or owner of a business is not the caretaker, but one takes interest in working for a business and invests his time and labor into the business or company, which goes beyond that of a steward who's role is mere caretaker that may have no long term investment. The employee is contracted and paid for his work by the boss or owner who's looking to possibly expand their "property" (in a financial sense), which is beneficial to the worker (as the worker looks to expand their income). I don't see how this would be institutionalized stewardship unlike the state.
Thanks Bert. My point in that section you quoted is that seldom is the boss the owner nor the owner the boss. This is necessary because usually the owner is a collective.