As I recall, Adobe was unwilling to abandon Carbon until Apple promised that Carbon wouldn't make the 64-bit transition. And even then, Adobe was pretty slow: C

As I recall, Adobe was unwilling to abandon Carbon until Apple promised that Carbon wouldn't make the 64-bit transition. And even then, Adobe was pretty slow: Creative Suite on Windows started including 64-bit versions in 2008 and required a 64-bit CPU starting in 2010, but the last CS version for Mac in 2012 was still all 32-bit. When Apple dropped 32-bit support in 2019 after a two-year warning period, parts of Adobe Creative Cloud on macOS were still not ready. Even Adobe's transition from PPC to Intel took 15 months after Intel Macs started shipping and 22 months after the x86 Mac dev kits were publicly announced (though I wouldn't be surprised if Adobe had a heads-up if not actual dev kits even before Apple publicly announced their Intel transition). And let's not forget all the fuss Adobe made when the rest of the world was ready for Flash to die. This company has a history of being very defensive about their technical debt.