I agree it’s not the best look, however just to be clear it’s not a workaround or some kind of hack, it’s valid Latex Syntax.
Unfortunately it’s not usually what we want in terms of layout.
To be fair, Desmos uses a package called Mathquill, and Mathquill itself has an outstanding Github pull request relating to this issue with rendering Limits. For this to be fixed at all, I’d recommend Desmos file a Pull request on the Mathquill page. Who knows, it can’t hurt.