This is just new ideas.-----The screw slot ones require that the screw driver is properly lined up and pushed into the slot.------Not so with the allen key ones.-----If the allen socket / wrench is in the hole it is " self aligned " and holding.----Just turn it.
Maybe it costs 3 cents more to produce each one.----Maybe no manufacturer offered them.-----Maybe the hex head is the preffered type for robotic assembly that is used today.----ETC , ETC .
On outboards it does not matter what you do.-----Somebody will figger out a way to damage it.-----Folks invent ways to destroy motors almost every day.
On outboards it does not matter what you do.-----Somebody will figger out a way to damage it.-----Folks invent ways to destroy motors almost every day.