Internally Adobe hated Flash. It strode right past Live Motion which used the UI paradigm of After Effects to produce animations which didn't cater to the traditional key framing model Flash was built on. I feel pretty strongly that there were forces inside Adobe that wanted to take advantage of the merger to bury the Macromedia IPs. Adobe had a great relationship with Apple. Photoshop was finely tuned to work on Macs and the majority of the creatives using it were working on Macs. Adobe could have threatened to put Apple's computers in the ground by limiting Photoshop support for OSX in 2009 in order to gain support for Flash on iOS. They didn't. They just never thought of Flash as an Adobe product. If Apple stopped supporting Photoshop things would have gone nuclear.