Is it wrong to make a post without mathjax? Should all such post be rewritten using TeX?
I think there is no doubt that if the someone uses kind of ASCII to write mathematical symbols, the post will become more readable after editing it and using TeX. In such cases editing the post is obviously the best thing to do.
However, sometimes people make posts in which they do not use TeX, but the posts are perfectly readable. (Although such cases are probably very rare.)
An example would be this question. Just in case someone will TeX-ify it, I'm adding link to the history of revisions, too. Despite the fact that the question is readable, it was suggested (already by two users) that the OP should rewrite it using TeX.
What is the community opinion on this?