We have some requirements pushing us towards a better HTML editor than the default rich text field editor.
The first one I found Googling is from Froala but a few years ago it didn't work inside an LWC - SF Lightning Component issue: not able to replace a textarea with third party text editor.
Is there a decent WYSIWG HTML editor that will run inside an LWC?
This is for managed package, so even when not beta the Light DOM (Beta) sounds like it won't be usable:
Distributing components rendered in light DOM isn’t supported. Component references in a managed package use the c namespace and would result in a namespace conflict.