Besides reasons that are already listed here keep und mind that Flash offered more APIs that browsers still don’t have - and so you can’t translate them to anyt

Besides reasons that are already listed here keep und mind that Flash offered more APIs that browsers still don’t have - and so you can’t translate them to anything. RTMP based video streaming was one of those. Some other networking APIs might be other cases. Of course you could make it work with less APIs - but the usage ping of „your app might or might not work when translated“ is a bit smaller