Washing machine hoses vary in quality and structure and components, but even the ones covered in braided stainless steel deteriorate over time and as they are constantly pressure loaded. Some of them will burst and disastrous flooding can happen. And hose failure happens even in tropical climates where freezing never occurs.
You go away to work, return home, hear water running, and the house is flooded. A washing machine hose is essentially just a garden hose inside your house - same size and same water flow. Imagine how much water you could hose into your house over 8 hours.
If you cannot get to the valves to turn off the water flow to the hoses, there are hoses that sense a catastrophic failure and seal themselves at the connection to the valve. Both my local Home Depot and Lowes have these in stock. There are also plumber installed or DIY installed devices that will shut off water flow if they sense water on the floor, and there are other types that sense water flow changes.
Shutting off the washing machine valves when you are away, or having another type of emergency shutoff system is just basic homeowner water damage prevention. If you have a well like me, another option when you are away is to just turn off the circuit breaker to the well pump.