Hoses can burst, for a myriad of reasons....I never shut off that valve and my husband has hissy fits about it on random occasions, he usually forgets more that I forget consistently.....:)
I've lived in houses with a washer with plain old hoses for about 50 years and never had a hose burst or even leak. And we never shut the water valve off. Lucky, I guess.
The highest quality braided stainless lined ones are better than the old ones. Also, now they have shutoff devices that detect leaks and shut off the water. Condo living has pushed the need for preventing leaks.