They are saying that your job is about preventing a slippery slope phenomena as pertains to scope creep, where adopting one large change can increase the propensity to consider another. I think you could also more accurately refer to it as a "sunk cost fallacy", a concept which you should also be familiar with. Rather than keep the product at its current size and risk an underwhelming release, we've already gone this far, why not give the sharks in the tank the frikkin' laser beams Dr. Evil once suggested?

I think the sunk cost is an example where there is a slope that actually is slippery due to to psychological biases. In the case of the live facial recognition, we are instead talking about a slope that is slippery because it gives power to the state, where governments are known for using their existing power to consolidate yet more power.