Unfortunately the sheer scale of updating that is not possible by just the mods etc, it usually comes down to someone who has searched the problem, come across the question, realized it's too old to apply, figured out a fix themselves, and THEN had the decency to update the question with an updated answer.

It's just unsustainable depending on the goodwill of users, especially when SO score means very little these days.

Edit : It might be very doable by AI.. But they would have to sacrifice their "no ai answer" policy. (maybe they have already)

It would take someone who actually knows React writing an answer that explains how it is different. Usually newbies are not in a position to understand when version differences are relevant and when they aren't.

On SO, it's often best if questions are somewhat version agnostic, and different answers address different questions.