Maybe that is a misunderstanding but I really like the new editor and I would not want to go back. The usability improved in the last couple of years and also the possibilities to adapt Gutenberg to your needs. You should give it another try.
My problem with WordPress at the moment is, that there are a lot of areas that could need some attention but the development is mainly focused on Gutenberg and Full Site Editing.
Maybe I can help out:
we added a flying carpet Ad via Adrotate to our AMP sites. You just have to use this format:
<a href="%link%"><amp-img src="%image%" width="450px" height="900px" layout="responsive"></amp-img></a>
If you want to display Ads in the AMP Version and in your normal Version you have to filter the content like this:
$content = preg_replace('/<img (.*)\/>\s*/iU', '<amp-img \1 layout="responsive"></amp-img>', $content);
