Get (a copy) from array does not trigger an error if you Get an index that does not exist. For example if you make a boolean array with 2 booleans, then try to Get index 3 (which is not in the array) it will just happily say “false” and move on. This can make things silently fail which isn’t good.
If you do the same thing with Get (a ref) it gives an error: Blueprint Runtime Error: Attempted to access index 3 from array BoolArray of length 2! from function: ‘ExecuteUbergraph_SK_Mannequin_Blueprint’ from node: Print String in graph: EventGraph in object: SK_Mannequin_Blueprint with description: Attempted to access index 3 from array BoolArray of length 2!
It seems like Get (a copy) on an index that doesn’t exist is giving the default value instead of giving the same error as Get (a ref).