"Full stack" means different things to different people. There are plenty of GC languages which are still relatively-high performance and can thus be used for technically-challenging, "system"-like tasks. In fact, this very variety is what makes it a bit hard to figure out what Red's unique selling point might be, although it's easier if you're familiar with its predecessor Rebol.
> There are plenty of GC languages which are still relatively-high performance and can thus be used for technically-challenging, "system"-like tasks
Unfortunately, they frequently lack the other attribute which makes C and C++ such pervasive solutions, namely portability.
Having "theoretical portability" (for example JVM bytecode) is not much use if your target hardware or operating system cannot support a JVM without you having to first port the JVM yourself.
