Dual engine shutdown is incredibly dangerous, there's no situation (other than a commanded shutdown) where that should occur.
Regardless of cause, regardless of if the pilot activated the thrust reverser too early, this is an incredibly dangerous defect that Boeing (or Rolls Royce) needs to fix before more people are put in danger.
Let me phase it this way: Even when the engines are literally on fire, they don't automatically shutdown, because doing so is considered too dangerous (since the systems don't know the circumstances, and even an engine on fire can generate thrust, and it might be your only engine).
Even if the defect was DISCOVERED due to a pilot error, it is still a defect and a safety critical one at that.
Regardless of cause, regardless of if the pilot activated the thrust reverser too early, this is an incredibly dangerous defect that Boeing (or Rolls Royce) needs to fix before more people are put in danger.
Let me phase it this way: Even when the engines are literally on fire, they don't automatically shutdown, because doing so is considered too dangerous (since the systems don't know the circumstances, and even an engine on fire can generate thrust, and it might be your only engine).
Even if the defect was DISCOVERED due to a pilot error, it is still a defect and a safety critical one at that.