The question that should be asked is if the faults of the application is severe enough that its worth continuing burning fossil fuels until/if there is a new and better source of energy. That is the counter part when determining a balance between the need for strict regulation and risk assessments. The damage we know we are causing with known technology, or the damage we might cause with new technology.

We have this kind of cost-benefit assessment in other regulations. It is always a trade off between the benefit of having them vs the cost of not allowing it, be it a new food safety restrictions or building codes. A replacement for diesel generators might be worth a slightly higher risk given how much damage those fossil fuel generators do to the environment, and the global commitment to prevent climate change.