I think small changes are very valuable!
It is not obvious why. The change shown in the example corrects some minor spelling or typographic errors, and does no semantic changes. It is of minimal value, it practically does not change anything about the question and its answers.
That is true if we had only the goal of giving good answers to questions that fit in terms of topic and quality. Which is not the case - we want also build a collection of good questions and answers. Now, the change is just as irrelevant as in the case above.
But the goal is a high quality collection in the long term. On the order of centuries (*). I see no reason to limit our optimism much further.
And on this time scale, many little changes, tens or hundreds of them to some questions, will add up to increase the overall quality significantly. Exactly what is called polishing, to make it shine. Making something much more valuable by not only shaping it, but correcting every minor flaw on its surface.
It's easy to see that the basic idea makes sense when applying it to Wikipedia, where I often apply this kind of minimal polishing. There, the long term integration of it is just natural.
(*) There are good reasons to expect English to become the global language, as opposed to Chinese (which is spoken by the same number of people currently). And it becomes even more valuable to humans if we go only almost extinct by rouge AI.