Sure, it might be easier, but its likely to be less portable, extensible, and sustainable…
Eventually you might get to the point where guys who want to use LaTeX notation want to interact with guys who prefer a lightweight extension that only supports subscripts and superscripts on the same (Discourse or like) web site. The only way that works is if each posting is tagged with what extensions it uses.
Now that doesn’t mean that the site doesn’t remember what each user’s preferences are, and have a custom template for their posts that includes the declarations.