Alternatively, companies hire multiple subject domain experts, and pay them handsomely.

The experts believe they've been hired for the value of their opinions, rather than for being 'yes-people', and have differing opinions to each other.

At a certain pay threshold, there are multiple peoples who's motivation is not "how do I maximise my compensation?" and instead is "how do I do the best work I can?" Sometimes this presents as vocal disagreements between experts.