To take the simplest example I can think of - and something which I am sure you would recognise from your own country past - how would you as a newcomer to a large farm approach the problem of a closed (or open) gate?
The rule is always that you leave it as you found it - closed or open - even though, for you as the visitor, its present state is less convenient (closed: you have to stop, open it, move through, close again) or seems careless (open: why have a fence if you leave the damn gate open?) given earlier gates you have travelled through. kvd 19 April 2016
Those gates could be quite difficult to open.
Some were old, leaning and splintered wood gates where you had to slide back a small piece of wood to open the gate. Some were no more than temporary structures, wire strung between fence palings that collapsed to the ground when opened and had to be lifted up again to shut.
Others were more modern, but getting the chain and ring off the bulb holding it could be quite a challenge for a child, especially if the gate had dropped slightly and had to be lifted before you could open or close it. And then there were the gates shut with twisted wire. I really hated those.
Within properties, opening gates could be quite fun because it was usually associated with bouncing across the paddocks while sitting on the back tray of utilities. Yes, we used to do that. However, on longer trips along the secondary dirt roads linking localities that ran through properties, gate opening could be a real pain. Between my grandfather's place, Foreglen, and Wallumumbi Station there were no less than 33 gates.
I don't know who invented cattle grids, slotted metal rods across the road. The Wikipedia article does not tell me, although the first US patent dates to 1915.
With time, the cattle or stock grid, often with a gate along side, replaced the gates on the dirt roads winding their way through the countryside. Stock find it difficult to cross the grid, so it serves the same purpose as a gate.
I do not regret the loss of the gates. They involved effort and, as an adult, opening gates does not have childish fun. Still, its another element now vanishing into the misty past.