ya ya traditional way sometimes is better 

but about the gas stove, as i know if the fire is off (no heat) then the safety valve will shut off the gas supply, so should still be safe ya?

a lot, look for "safety valve" at the specs. i've been using those cheap hob (less than rm500) that comes with this function.

but as mentioned above, this just a fail safe device. it's still better to prevent it from happening at the first place

Fotile gas hob have this function when fire went off and gas still leaking it will stop it.
There is even some hood that would automatically turn on if detected gas odor.

But like some said here, if it fails are you willing to trade your most important thing in your life for it?

You asked if such stove exist right?