Turns out Flow is a great tool for newbies compared to free-form wikitext. Well, at least until the point where they need to create a link or they want to add some basic formatting. Especially if the newbies are defaulting to VisualEditor, they might have difficulties posting anything other than plaintext and full URLs.
Trimming the selection was discussed, and discovered to be both subjectively-desirable and technically-complicated. Newcomers will eventually have an alternative VE interface, to satisfy the requests for a less complicated set of buttons. So, please implement the full/default WikiEditor toolbar.
Further notes at T90052: Edit-tools in wikitext
See also: T93243: Flow's VE toolbar v2