If I am composing a list in the text editor, I may use the Tab key to indent and make a subpoint. Usually, if I wish to jump back to the first rank of bullets or numbers, I would hit Enter while the subpoint line is blank and it will jump back. In other editors, there is a dedicated button in the editor bar with an arrow ← that will also jump back. Without one of these features, it is currently impossible to continue making top-level list items once one subpoint item is made.
Oddly enough, the editor here on the community forum appears to support markdown (which also would be a nice update to the editor in the item updates UI) so I can’t demonstrate my concern in this post.