It looks really pretty without one but I know that won't stay for long, which is why I put a flip case on mine.
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Most phones are built to withstand average use, and if you are careful enough you don't need a case.
But if the phone is not up to par with being dropped on occasion, it is best to equip it with the protection it needs.
To be honest, it doesn't really matter if you put a case on it or not, the kinetic energy is absorbed through the body of the phone, the case is likely to be insufficient in protecting the phone, you could put your phone in an iron block, drop it from 1 story, and it will still break.0