Oh, come on, people. Flash was always a hack. Real web engineers always hated it. The Web was missing features, and Adobe filled that gap, but did so by subverting the transparency that was the whole point of the Web. How many web developers have thrown up in their mouths a little bit on coming across a website for a small business, designed and sold by a 'designer' with good intentions, which dances and sings but renders the poor oblivious business utterly invisible to search engines?
While Flash was relevant, the interstitial landscape it created was host to a horde of artists who committed themselves to learning its rules but who were ignorant of the shape of its looming boundaries. Now that the needed standards have been provided by the responsible standards bodies, the designers cry out in shock as the gap which became their home closes around them.