In my view CKEditor5 is a big level up in usability for clients and developers. It's easy to embed videos, facebook/twitter content etc, and images are dealt with in a more usable way.
If you want to take an incomplete but functional fork that includes CKEditor5 in the admin screens:
https://github.com/jackhiggs/CouchCMS/commit/11485390500feeacea28c267aa3019d0e3df7403#diff-e26c5ea6f12259e5ae18049dc70edce5L821
What isn't supported are repeatable richtext regions. But normal richtext editable regions work just fine. I haven't analysed any potential security flaws or additional functionality that was baked into the current CKEditor - the code to instantiate editors that I replaced is complex.
It also requires a bit of config setup for image upload in CKFinder in includes.
If you want to take an incomplete but functional fork that includes CKEditor5 in the admin screens:
https://github.com/jackhiggs/CouchCMS/commit/11485390500feeacea28c267aa3019d0e3df7403#diff-e26c5ea6f12259e5ae18049dc70edce5L821
What isn't supported are repeatable richtext regions. But normal richtext editable regions work just fine. I haven't analysed any potential security flaws or additional functionality that was baked into the current CKEditor - the code to instantiate editors that I replaced is complex.
It also requires a bit of config setup for image upload in CKFinder in includes.