It was pretty clear to everyone that Justin Fields would have a challenging rookie season.
The Chicago Bears offense wasn't good. When then-coach Matt Nagy stubbornly refused to even entertain the idea of Fields beating out Andy Dalton to start the season, it was clear the coaching staff might not be an asset either. It was going to be a positive if Fields survived his rookie year with some bright-spot moments (which Fields provided) and then the Bears would fix things around him in the offseason.
Those fixes never happened.
There's a blueprint for teams with early first-round quarterbacks, and it's not complicated.