I agree with improving existing answers; so does the help center:

When should I edit posts?

Any time you feel you can make the post better, and are inclined to do so. Editing is encouraged!

Some common reasons to edit are:

• to fix grammatical or spelling mistakes

• to clarify the meaning of a post without changing it
• to correct minor mistakes or add addendums / updates as the post ages
• to add related resources or hyperlinks

I can't speak to the decision on the roll-back, but that appears to have been updated recently.

I agree with improving existing answers; so does the help center:

When should I edit posts?

Any time you feel you can make the post better, and are inclined to do so. Editing is encouraged!

Some common reasons to edit are:

• to fix grammatical or spelling mistakes

• to clarify the meaning of a post without changing it
• to correct minor mistakes or add addendums / updates as the post ages
• to add related resources or hyperlinks

I can't speak to the decision on the roll-back, but that appears to have been updated recently.