In general, I agree with you. However, I'm somewhat torn here, as the point is for ease it typing math. It already has an allowance where what you type is not

In general, I agree with you. However, I'm somewhat torn here, as the point is for ease it typing math. It already has an allowance where what you type is not necessarily the same characters that will get rendered. Consider the example the page loads with "sum_(i=1)^n i^3=((n(n+1))/2)^2". Some of those parens are dropped entirely. Some are changed into taller versions. The + is not the same as the \plus sign that is rendered. So, yes, it is a restriction that comes with some tradeoffs. My gut is that this is probably fine for the vast majority of use cases, though. Such that it was probably the right call.