Just as a place to gather votes as a clear signal:
Yes, the braket extension is appropriate and useful. It should be enabled on this site whenever the MathJax version is upgraded to v3.
(Vote up if you agree, down if you don't.)
Here is one option put forward by the SE developers: switching from MathJax to prosemirror-math. For a quick look at how it works, I'll just pull this from their readme:
Unlike other editors, this plugin treats math as part of the text itself, rather than as an "atom" that can only be edited through a dialog box. For example, inline math ...