I own various hoods. I even use them when I remember.
Need? Depends. Certainly doesn't hurt. Some things will make them more needed then others.
Like I said I've got various. The easier to use are the factory ones for each size lens. Check Keh and if you're lucky you might find them for a fraction of the new price. I've also got a bellows hood. It's nice with a built in 3x3 filter holder. OTOH I can't see using it handheld. Also can be cheap used. The generics will never be "perfect". My hoods are all shaped like the negative. They are the right distance but not too far. Plus used they didn't cost any more then a generic rubber hood. OTOH even a small rubber hood shouldn't hurt.