. I respect your opinion and you're correct that you'd need to set the output for 1080P if you wish to benefit from 1080P OD programming. It probably doesn't matter much if you use 1080P or 720P for regular TV programming, but it's probably best not to use 1080i.
One of the main questions in this thread is "what is the incoming signal to the STB" and that's 720P for regular channels and can be 1080P for OD. There is little or no 1080i coming to the STB.