> A fixed layout is not going to work for all devices.
Designers are also making their choice with HTML nowadays : Desktop is not supported anymore. Look e.g. at twitter, a billion dollars company switching to mobile web only. Flash could easily implement media queries to re-layout itself.
Just by the padding in the buttons it's obvious that twitter's current site was built for mobile. Sure, it's responsive, and i bet flash could become responsive if it was still alive. HTML games however are also non-responsive most of the time just due to the nature of their use case.
They might have meant mobile-first and not mobile only. Their desktop site is very clearly designed for mobile, the main content does not change at varying screen widths. The sidebar and header do a bit of restyling, but thats about it.
Designers are also making their choice with HTML nowadays : Desktop is not supported anymore. Look e.g. at twitter, a billion dollars company switching to mobile web only. Flash could easily implement media queries to re-layout itself.