The idea of burst discs is that they will rupture in case the pressure is too large, instead of having the tank exploding.No burst discs ? Why do they think their dangerous ? Guess if your careful filling tanks and don't leave them in the heat/sun you'd be OK ?
But in reality it is much easier that a burst disc ruptures due to corrosion, leaving the diver out of gas.
Statistics show that tanks do not explode due to overpressure.
So a burst disc creates a significant risk of failure whilst providing protection against a very rare risk, which is better prevented with our mandatory hydro test every 2 years.
Here we do not have VIP either...