I am not sure about this. Fields has been set up to fail his entire career.
The Patriots this year with Fields would be a significantly better team. Fields has an elite skill set at running. And he's got a great arm. You can work around that. There is talent there.
Mac has an elite skill set at punching people in the nuts. And that is it.
At least on what we were sold, they were sold as opposites.
Fields, great legs and arms, unclear on decision making / processing.
Mac, not a real threat with legs and arms, advanced processing / decision making.
today they both seem incapable of good / quick decision making, neither is throwing the ball downfield much at all, though Fields still impressed with his legs.
I do question why you conclude that Fields has failed due to coaching and Mac has failed because he sucks. There were a number of people who felt Mac was being failed by his coaching that have now changed their mind and believe he is just plain bad, I personally think we will find the same out from Fields if (when) his coaching changes.
He just led a team for a full game and failed to score a touchdown while he was given four turnovers / additional possessions by his defense. That is really, really hard to do.