This is the real answer IMO. For example, if you have a 2TB drive with 50GB available space left and are trying to move 1TB of data, and the move is requiring copying, but all individual files on their own are less than 50GB in size, then I’d be pretty upset if my computer was unable to move the files just because it was wanting to not delete anything until the end.

But ideally I’d want the system to delete at the end if possible, and to otherwise delete as needed, instead of either doing only all at end or only after every single file.