I've been using SD WebUI for months, running local on my PC.
It's great to also add some of the many scripts and extensions that have been developed for it.
Another great thing is to use the other models derived from SD, refined on other image datasets with other styles. for example StudioGibliSD, WaifuDifusion, TrinArt, ArcaneDifusion, several specific ones to create pixel art, and others.
also the integration with other applications such as Photoshop or Krita
In general, if you want to take advantage, it is necessary to study the interface and its many options, the generation techniques, the "prompt engineering", ect
I have even collaborated on github, reporting errors or suggestions that have been taken into account.
I've even been planning to redo all the art from a little point&click adventure game I did over 15 years ago.