Once I stressed the hose by bending it, the cracks were close to 1/32″ deep.
It was a real eye-opener. Before bending it, the hose looked “fine.”
In the event of a failure, I believe this hose, in particular, could be isolated to stop the leak. However, the resultant discharge of coolant wouldn’t be pleasant to deal with, especially if it happened on the road, at night, and in the rain.