Biggest reason - it gets rid of labor from kids / men stacking square bales in the barn, the machine it self is less complicated and cheaper to make and maintain.
Second. - Barn fires don’t happen when round bales are outside (less insurance), Bail stackers are crazy expensive, and moving round bails is a PITA... they don’t store efficiently either so less Barnes are required (lower fixed cost).
Last - Gas ain’t cheap, when you are bailing you can leave them there, or have another tractor or loader running them back to a barn somewhere... that’s more gas and road wear.
Due to this they made that outside wrapper to help protect the hay....
