I personally have noticed a lot of posts were all of the math is written in plain text and have tried my best to fix change them, is this even something that I should even be focusing on, or should I just leave the posts be? I think overall the MathJax formatting looks nicer, is clearer and more legible.
I agree with the posted comments to avoid only making trivial changes, such as
$7$ with no other post improvement, but if it contains equations that you're making more legible, then this is a good way to improve the content of this website. Thank you for this important work.