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
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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
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