I bet a turbo 4 would be much easier to setup, layout-wise than a turbo or twin turbo V8...I would choose the SR20DET or a 13B twin turbo myself.
As to "what's the point?", maybe some people don't like the V8 and it's pushrods, maybe they like the high pitched sound of a 4 banger.
When I started the forum it was called the V8 Swapper's Forum (cool name, huh?) but since we became Hybridz, we now have hipo I6, V6 and V8s here. And it's definitely for the better!
I say, do what you wanna. Even if the engine's a little smaller, even if it's a little less powerful. Do it cuz ya like it!
Owen