The situation is more or less resolved on OS4 and MorphOS... and I guess AROS, too, but I don't follow it much.
But the largest percentage of Amiga users are still on OS3, and that will continue to be the case as long as there's WinUAE and Amiga Forever. Yeah, you could just switch over to the host system to use Firefox, but a native browser would make for a more seamless experience.
I don't know why it's taking so long to get OS3 to the same level as the other systems. There's an awkward re-port of NetSurf (why didn't they just backport the OS4 version?)...
I still think a bounty could help.