So sorry for not answering, I didn't get any notifications of issues posted here. I'm on top of it now :)
The use case for this plugin is pretty narrow, I basically made it for myself :) What I needed was this:
Say you are building a property management theme. In this theme you want to allow users to add custom fields to their properties. Each user of the theme will want something different. Price, floors, bathrooms, area, year built, etc. So, they use ACF to create the fields and then these fields show up for their properties in the backend. So far this is regular ACF behavior.
However, once they want to display these properties they way not want to show all their custom fields. On listings on the home page they may only want to show the price. On complete listing pages they may want to show the price, area and bathrooms. On a single page they may want to show everything.
In order to give people the flexibility to show whatever field they want I created a field selector field :)
Hope this helps,