Not sure if that many people understand the essence of rangefinders. Try to view outside the frame with any EVIL.
You are confused about "the essence of rangefinders." Let me help.
The ability to view outside the frame boundary is a property of some
viewfinders but by no means all (see,
e.g., Contax G). This has little to do with
rangefinders, which are devices that use parallax to measure distance.
We might also ask how "decisive moment" pictures are taken with SLRs -- especially considering that many, many more decisive moments have been captured using SLRs than (say) Leica M's. This might suggest that the advantage conferred by seeing a bit of what's outside the frame is smaller than some people think -- especially when we consider the relatively abysmal framing accuracy of many VF designs.
On the other hand, the Fuji X-100 is
not a rangefinder and it
does allow you to see beyond the framelines.
I note that both the NEX-7 and (in its TTL mode) the X-100 don't have the problem of viewfinder parallax which is a significant limitation of conventional "RF" cameras like the Leica M's. There are real and important ways in which these modern mirrorless cameras are superior to more traditional designs.
Every design has trade-offs.