Hi Mihai,
Have you checked out the ckeditor widget? That should have the same functionality as the rich text editor.
https://appstore.home.mendix.com/link/app/1715/Mendix/CKEditor-For-Mendix
To answer your question, the rich text editor is marked as platform support so it should still be maintained. Where did you raise your issue?
There have been several releases of the widget after your question.
So yes: it is still maintained :-)