We're back to the philosophical differences. I wouldn't put an Oscar alone in my 120 gallon. To me, that's no fun to watch - a large predator pacing. My view is not one the monster fishkeeper group would appreciate, which is fine, since they see my favourite fish as snacks for their pets.
A lot of aquarists don't see it that way. I disagree with them. When people offer advice we disagree with, I think it's best to offer reasons why rather than to challenge in a way most readers are not going to understand. It undermines the person posting a valuable response, and it doesn't tell anyone why you say what you do.