I don't even consider Flash as part of the web. For me, the whole web ecosystem is about open, human-readable, text-based formats – namely HTML, CSS, JS – backed by several high quality (open source) runtimes available for virtually any platform. No authoring tools needed beyond text editor, source viewable by anyone. You can even access the content with tools like curl and grep.

Flash is nothing more than arbitrary, proprietary binary thingy, which just happens to have a runtime implemented for plugin APIs of few selected browsers on few selected platforms.