That I’m not sure about. I suppose it’s partly to do with what will be used by the most people. I like the add-on system because helps keep the core plugin lighter. I honestly don’t like using plugins that try to cram everything possible in because they start to get bloated. While I use things like the repeater field on almost every site I build, I’ve only needed to allow the selection of menus on 1 of the many sites I’ve built.
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