The problem is not including it in the theme or a plugin, the problems start when there are different versions included. This only works if everyone includes the same version. This can be said for any library that could be included in a theme or plugin.
Right now there is a compatibility problems with ACF4 and 5, but there would also be a compatibility problem with 5.4 vs 5.5 (introduction of term meta to ACF)
The same problems happen when 2 plugins provide different versions of Select2 or Font Awesome or for some reason load a different version of jQuery than is provided by WP. The problem is not with ACF, the problem is that if you want to do this you need to keep it updated and you need to depend on every other developer that’s using it to do the same.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users
Helping others is a great way to earn karma, gain badges and help ACF development!
© 2023 Advanced Custom Fields.