All editors for Plone are a disgrace, their usage is humiliating for content editor for a variety of reasons.
In particular when you deal with tables (resizing of cells) and images (resizing of images) you never get what you want to achieve - also with some default misconfigured HTML filtering settings. Another major usability fail are the widgets for choosing images and content references.
The Gutenberg editor perhaps give certain content editors a better experience. However consistency is king. Usability when it come to specific integration to Plone and Plone resources (images, contents, links) is king.
The Gutenberg editor is unlikely a good choice when you work on longer documents or if you are a professional writer (TinyMCE style editors are somehow better suited here).
So we have different audiences and there is not really one approach that fits all. That's why we integrated Smashdocs with Plone for professional content authors - again, this is not a solution for standard writers.