Iger put Disney on the right path after Eisner. He fixed a lot of the issues animators were having and put creative decision makers in the right places. Marvel, Star Wars, and Disney+ are just a few of the highlights of his bigger impact. He fundamentally understands the direction of the business. (So long as it doesn't get disrupted by AI/ML, which could cannibalize franchises.)
Iger wanted to retire, and he picked one of his subordinates to take over. He picked very wrong.
Kevin Mayer and Peter Rice were other picks that got snubbed. Meyer became the short-lived CEO of TikTok US (and left after the Trump admin threatened to shut it down), and Chapek got rid of Rice.
Chapek bungled LGBT / Don't Say Gay, and for the former head of Parks didn't seem to manage COVID right.
Iger's biggest mistake was Chapek.
It's good to have Iger back. But he has to find a new replacement.