[olla]

Firstly jQuery would not help a lot here, as wysiwygs are largely about fixing browser inconsistencies and bugs. You'd like to fix those as close to the source as possible. The other quite big argument is that events triggered in jQuery cannot be seen by other modules correctly. Even not by another jQuery instance. In CMS-es on the other hand you can easily be dealing with many jQuery instances. One on the site itself and another for administration components. Vanilla.js makes things on this scale smaller too.