As you may or may not know, we briefly had MathJax support on our main site. However, it caused all sorts of problems and was removed. For whatever reason, MathJax support was not removed on meta. While this doesn't affect typical questions posted on meta, it causes issues in the Sandbox when users write challenges that have embedded formulas which render nicely in the Sandbox and don't render at all once it's on main. More importantly, causes issues with snippets and code blocks.
It doesn't make any sense to have MathJax here and not on the main site, thus I believe MathJax support should be removed on meta. (At least until MathJax support is reinstated on the main site, if it ever is.)