You all appear to missing a very critical portion of the article:
But at this point, they said, such options appear to be losing favor among regulators.
In other words, the FAA/EASA can't agree on what they want.
It's unfortunate and ironic that the more safety critical the change, the more difficult and time consuming it is to get it certified. I ran into this phenomena many times during my career - and that was without the political, lawyer, and ass covering complications that are undoubtedly coming into play on this issue.
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