Obviously, if your cheese works, you won't lose.

I'm just pointing out that fast, fast reapers (when I say fast, I mean 7 rax, not delayed reapers) is cheese because if you don't succed, you pretty much auto-lose.

Cutting SCV production in order to get a rax at 7 supply (that's what I mean by 7 barracks) will severely cripple your economy. Think of it is self inflicted collateral damage.