Because I think it's a lot harder (both for you and for your users) than you thought at the time, and I hoped you wouldn't waste your time (and your users' time) on it. Personally, I think GC is the way to go to keep your (programmers') sanity. If you worry about GC pauses in time-critical sections, provide for a way to turn off the GC temporarily for such sections.
You might want to mark such non-GC sections/functions specifically and enforce statically that no dynamic allocation may be triggered from within them. Kind of like a monad. No allocations, no GCs, no headaches. Simpler and more flexible than the Rust model.
> No insult was intended.
I didn't read that as such!