It’s maddening that you can’t simply convey that to them.

If these were the kind of people interested in the conveyance of practical, realistic, useful and truthful information, you wouldn't be leaving. The beauty in elegantly crafted work? Entirely lost on that sort. Yet every excellent worker I have ever known has not only seen but thrived on creating just that. When work, especially creative work of any sort, is The Very Best, it stands out, and good people know and love obviously exceptional work.

The loss is theirs, but as you imply, it's much, much more than just losing one employee.

Glad you've made the decision to go, and honestly the whole clashing arrangement sounds like oil and water -- integrity vs greed -- so chances are excellent that at some point they would make the decision for you if you were not making it yourself now.

Watch your back on the way out, and best wishes for a better workplace.