Jim and John still run the show.
When I first came here a few decades ago, we had only a few HTML tools available to us. It was pretty primitive around here. Over the years JimRob and John gave us a good set of tools to make our posts better and make us better contributors to FR. The HTML Sandbox is a fine place to learn how to do the basics and even do things that I've never had to do, such as post arrays.
I ve never seen where it is mandatory for anyone to go to the sandbox and hone up on HTML for the sole purpose of posting on FR.
If that is what you chose to do DECADES ago (no one cares) than good for you, many don’t so deal with it and get off your holyer than thou, long time members hi horse.