The ‘advice’ has some interesting points.
In many ways the manufacturers already work together and with the regulators; there is a common interest in long-term safety. Perhaps less so for operators where short-term commercial interests tend to dominate.
I doubt that operational regulation would work based on best practice. Who decides what is best, and is ‘best’ good enough. Alternatively, nor may the current regulatory system, which increasingly fences-in operators / pilots, achieve the necessary safety improvements in a time scale to match the evolving operational environment.
Thus the industry requires change, but do the regulators and operators have sufficient time and resource to effect a meaningful change while they are either busy legalising existing regulation within Europe or seeking workarounds to the operational rules. So a cynical view might conclude that ‘best practice’ is a reasonable compromise and has chance of succeeding at least as good as the current system.
Of interest the UK CAA is promoting the identification and sharing of ‘best practice’ in their
Strategy for Human Factors.