Say what you must, a browser with full HTML 5 support is vital to any current or future Amiga OS 4.x platform. Since, Adobe Flash or for the matter any other similar technology is highly unlikely to appear on an Amiga OS 4.x platform, HTML 5 is the way to go.
Sooner or later more sites will start streaming video via HTML 5. Maybe, then we can start having a more modern computing experience on the Amiga platforms!!