Not to defend Iger, but DL Park was a pretty complete park when he took the reins - both in terms of quality and space. There’s really not much room for additional expansion, and it was by far (and still remains) the most attraction dense Disney park in the world. He was right not to mess with a good thing. At the end of his tenure, he green-lit three net new rides in the park - RotR, MF:SR, and MMRR - none of which forced the closure of existing attractions so again, all net new.
He was right to focus his attention out East, but the problem is he created some good rides but never added much capacity - a lot of replacements rather than additions. And unlike DL, they had room to do additions at WDW.