Try to consider vandalism also.
We frequently had issue with someone taking a small sharpened stick,
forcing it into the keyhole, and breaking it off.
On a cable around a tree, to hold a gate, we loosened 2 bolts and could take it to
the shop to work on it.
10 feet up, not able to take it apart, a jammed lock would be a problem.
Went to a cheap Master Lock padlock. No issues in over 10 years.
And it still works! Every few years it gets a couple drops of oil from a dipstick,
But it's been fine out there.
