Apple could have launched in iPhone like product years ahead of when they did if they kept that branch of the company afloat. That would have been a real 'visionary' move. Instead, they were forced to differentiate themselves in a crowded marketplace by emphasizing little design flourishes and style.
Job's only real contribution is managing to gaslight (a.k.a, his "reality distortion field") the entire industry into thinking he had any real insight or ability beyond that of a typical middle manager with a cluster-b personality disorder.
We can't speculate on what a Apple Prime would have done without Jobs. But we do know that his single mindedness about making arbitrary changes cost them several years in the 80s and led to the slump in to the 90s.