Here is, in my opinion, the only things that ACF is missing :
Could it be possible for you to allow the drag and drop sorting of the groups of fields ? You implement it inside a group, why not on groups ?
Did you get anywhere with the devs on this? I want to be able to drag and drop the fields in a custom content group rather than having to create another custom content group that replicates the other’s fields and gives a number for each one to enable ordering in a page.