Realistically the fan isn't going to fall even without added support - the boxes are mounted pretty securely since some light fixtures can be pretty heavy. I had one in my old condo where I had no access to the joists and it was fine. However, if it's feasible there isn't really any downside to adding the extra support, since the cost is pretty negligible and in a house where you can access the attic it usually isn't very hard to do. I agree with Jacks about not buying a cheapy fan.
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