Your description that a box-and-1 is "basically ball denial" does a very poor job of explaining what the defense is actually doing.
The Blazers have been the 3rd worst team in the West without Ant and are still the 3rd worst team in the West with Ant, so I'm not sure I'd say the Blazers play "way better" without Simons. Simons certainly wasn't the main problem tonight.
Simons is a flawed player. I think we both agree he's not a true PG (nor is Brogdon or Sharpe), but he might be Portland's best option at the moment. I think Ant is a good, not great player. Same thing I say about Sharpe. Neither are worthy of getting a big chunk of the blame for the team being 6-17 as they're being asked to do more for the team than they're probably ready to do.