Flash also made distribution very easy: all the code and assets could be bundled in one compressed SWF file. Now we have lots of js files that are minimized and bundled and other loose asset files.
This is the biggest letdown of Flash being discontinued. How can an artist distribute interactives as a single file now? How can a gallery site host user-uploaded interactive animations without allowing its users a platform to inject arbitrary javascript? (At least .swf provides an attempt at sandboxing.)
