This seems to be an intentional choice, apparently due to the computational load of running such formatters? ([thread on all MathJax supported SEs](https://meta.stackexchange.com/questions/216606/which-stack-exchange-sites-use-mathjax))

On second thoughts, I'm not that sure if the BioAc SE will ever need as much math notation after all - even though it would be nice oc. Some of the solutions to overcome the lack of math notation are in this QA thread: https://meta.stackexchange.com/questions/30559/latex-on-stack-overflow