Around the time when Airbus advised changing the callout for "LAND" from
Land - green to a simple
Land, as well as adopted
Continue instead of
Landing at minima, there was a Flight Operator's Conference presentation on the whole topic of reading items and colours (also, A/THR -
white was stopped then)
whereas adopting aircraft manufacturer's SOPs hands responsibility back to the manufacturer?
Most certainly not. But the other reasons you mention do apply, I guess.
More importantly, many woke up to realize the original SOP are carefully designed by far knowledgeable folk than their own pilots. Take my word for it if you will, there's still enough to dispute over even when using the original books.