That makes no sense; then I might as well use a different system that boots OS 9 and a KVM or something rather than boot into a lesser emulation. The whole point of Classic is not necessarily compatibility, though it is more compatible than SheepShaver, but that I can use Classic apps and my regular apps at the same time. Rebooting just to jump in and out of my favourite, wickedly fast audio editor is silly. Leopard doesn't have it, so it doesn't let me. Of any group out there, I'd understand this one to understand that at least. >
The other reason I don't use Leopard is purely the fact I think it looks worse. I really don't like the visual changes Apple made; getting rid of the pinstripes was a good thing, but Tiger has that, and I personally don't like the really deep greys and more garish control colours.
Mike, Safari 4 has probably an opcode-type JIT (it's been a long time since I looked at WebKit in detail) but I don't think it goes lower level than that right now. It's inevitable however. I don't know what to tell you about Mozilla's 10.5 support, you're asking me to justify the actions of an organization that I sometimes don't understand.
(OTOH, I can see their being unwilling to not support an OS that Apple themselves now doesn't support other than probably a couple more odd iTunes, QT or Safari updates.)