Every time a user enters Special:CX, the article selector automatically appears. This is an exaggeration. Often the user wants to continue a previous translation and closing this window is an unnecessary step. I've seen users trying to click "Create a new translation" and getting nothing because the article selector is a modal dialog.
@Pginer-WMF, can you please remind whether there is any need to auto-display the article selector? I have a vague recollection that it was needed for the license, but I'm not sure that even that is needed any longer.