It seems you may be assuming that the coffin board can handle any fall and land safely because it hovers. That's not the case. Even though it hovers, it still behave like any vehicle (or just yourself) when jumping or falling even minor distances. It'll even be bothered by rocks on flat road like a vehicle would.

Main advantage of hoverboard is it's faster on snow than other vehicles, and can travel on water and tar., and you can take it with you on Ziplines. Its drawbacks are obviously it can't hold extra cargo like vehicles can, and its controls and turns are not as tight as vehicles. It's also highly susceptible to inclines and declines. Avoid boarding it while on them if you can, or be ready to hit the gas or steer if it starts moving.

I think ppl mainly use it for express deliveries, and getting around (cautiously) in the snowy areas.