[catmanjan]

I'd argue that none of those can do both the art and programming side of things as well (for beginners) as flash did

I haven't used RPG Maker in a decade, but when I did you had to import sprites, same with GameMaker. JS doesn't help you with art. Unreal Engine has a basic modeller but you have to use Blender which is quite complex for beginners

Flash was like an animated paint, super accessible