Charles Choi has a new announcement about his Casual package. Several of his users encouraged him to offer Casual to Emacs core or Elpa. He did that and, of course, he got push back. The main complaint was that there were too many apps.
I’ve always felt that having separately installable apps was an advantage. Others disagree and so Choi has implemented a new package that includes all the casual apps and has announced that he will remove the current apps from MELPA shortly. Take a look at Chou’s post for the details.
I don’t understand why any of this is necessary. The purists insist that MELPA is an illegitimate repository because … reasons. But the truth is that almost every popular Emacs package is curated there and that for all intents and purposes, MELPA is Elpa. I would have been happier if Casual had remained on MELPA and the various apps had remained separately installable.
Regardless, if you like the Casual apps—and there’s a lot to like—you will need to take action to update your configuration. Perhaps the Casual apps will one day be absorbed into Emacs core and all this silliness will be unnecessary but until then you will have to update your init.el to keep using them.