I think we're in agreement here. I wasn't trying to say that corporate leadership is bound to a specific interpretation of what "best interests" means.
That was actually my point in the GP comment, though I may not have phrased it clearly enough. The article and quotes linked earlier are just calling out that there's a debate as to how "best interests" is interpreted. Some may see that and consider short term profits, others may use it to justify focusing on long term profits and company health.
The debate is there for sure and the law is vague enough to allow many interpretations, but all interpretations still have to be based on the idea that leadership is doing what they believe is in the shareholders' best interests in one way or another.