“reverse is very important, even life saving” and are you aware of the risks to be considered when relying on reverse?
The certificated landing performance for commercial aircraft does not normally consider the use of reverse unless the system can be shown to be highly reliable.
Reverse credit might be allowed for contaminated operations, but this is mitigated by reduced exposure where crews are expected make every effort to avoid the conditions, and that they know the risks and have procedures to minimise them.
Relying on reverse on contaminated runways can be like relying on a leaky life boat.