According to Shall we have MathJax?, to enable MathJax would require a demonstrable need.
How can we demonstrate this need? Perhaps by creating a CW list of questions that would benefit from proper notation?
To what extent is this a catch-22, in that the absence of MathJax restricts the ability to demonstrate its use. Questions that require math might be asked elsewhere, like stats.SE, physics.SE, etc, even though they would be appropriate here.