Whose convenience and efficiency?
If we take one step back we can ask the question whose convencience and efficiency we are talking about. Regarding facial recognition surveillance technology in public space two main parties will benefit from a slow and steady introduction of the technology: governments hungry for control and industry seeking product-market-fits.
Governments are likely to face less resistance when far-reaching surveillance technologies are introduced slowly, because of normalisation of the technology, and citizens getting fatigued and weary after being mobilized by civil society for every expansion of the development.
Corporate calls for ethics committees serve to aid function creep, supporting a slow and steady expansion of the technology. When over time the implementation of the surveillance technology is normalized, the use can be expanded, leading to a new demand for it.