It was a great development experience, destroyed by pitch forks and lanterns by the folks that a decade later have failed to deliver a sound alternative.
Hence why the gaming industry is focusing on streaming instead.
Flash was destroyed by Apple, which had no interest in improving the web either. The iOS platform turned out to be a pretty good replacement for Flash though.
Sure, but what's the point if it's not supported by Safari. Adobe Air was at best a porting aid to get your old Flash code wrapped in an iOS app, but the writing was on the wall and nobody in their right mind would start new Flash projects.
Hence why the gaming industry is focusing on streaming instead.