I have 11 different contentypes in one databasetable. Whed I add pulishing Info I had to add each field to each conent. It would be easier to use the original Joomla field - change app folder, storage and maybe name and then save as copy. Spend a lot of time.
Maybe if this would also be possible for Forms, Lists and Templates to get a copy to add new fields etc.
That would a nice feature, yes, perhaps submit feature request on github. Meanwhile you can use fields created with storage unlocked, which means field can be used in multiple content types (like article fields that can be used in any ct)