Though not daily, from time to time it would be really nice to be able to use typesetting (like MathML, Latex, etc) to be able to express formulas etc for theoretical stuff.
In the long run, I think the site would benefit from it since it would encourage more detailed explanations in question/answers.
The functionality exists on other sites, ex. Math, so it should not be impossible to add the functionality here as well.
Not enough questions/answers would benefit from Math content
This may well be the case, but it may also be self-fulfilling. If one can't add Math content, question/answers may be added in a less mathematical form than they otherwise would
Enabling the proposal is resource-demanding and would cause a slowdown to all pages on the site, not only those with mathematical content.
I can totally understand this objection, especially in combination with objection 1). I have no idea whether it would be possible to enable/disable[default] for individual question/answers so that only pages with math content would suffer from long load times.
Images of formulas can be used instead
I don't like this suggestion at all. It is almost as bad as pasting images of tables and data into a question. I think it severely cripples the possibility to reason about a question in an answer.