Shaun_Max I've worked with both AIR and Haxe+OpenFL and I'm fine using those tech stacks. But it'd be a mistake to assume every dev is on the same page as me.
Back in the day, I worked with other fulltime Flash developers and a few absolutely hated AS3 and preferred C++. And I've met devs who hate C++ (one even claimed that object-oriented programming was a "mistake") and instead prefer to work in just straight C.
It's one thing if an employer dictates the tech to use. But if you don't have to answer to anyone else, do your project how you see fit.