The consequences in worst case scenarios of severe turbulence in flight can be significant and sometimes result in critical and serious injuries some of which can be fatal. Wearing seatbelts minimizes severe injuries
Royal Aeronautical Society reports: When a Singapore Airlines Boeing 777-312ER (Flight 321) on 21 May 2024, operating a sector from London to Singapore encountered severe air turbulence in Myanmar airspace, many passengers sustained a range of critical, severe and minor injuries including one fatality.