Its not the main reason it was introduced23.21.159 said:THIS!
All the discussion on the sub rule and its removal seems to have completely ignored the main reason it was introduced !!!
I liked it and would have preferred 2 and 2. Maybe even more subs if you like but I reckon 2 interchange only.
It was introduced with a interchange cap to get players more fatigued to open up the game because there were too many stoppages. It has been scrapped alongside a reduction of interchanges
I agree that a bi-product of it was the ability to offsett an injured player but it wasn't the reason is was introduced