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adobe mismanaged the hell out of flash and steve jobs sealed the coffin and i'll never forgive the two companies for rolling the state of web development back two decades
the accessibility thing is a real issue but that's more a factor about how accessibility just hadn't been a priority in the web until recently. if flash was still alive i'm sure accessibility could be worked into it now
if you are a web developer today and you are "thankful flash is gone" or think all flash was was "inaccessible webpages" and "just a security exploit", you either never used flash or never understood it in the first place