why lorica segmentata uses very thin hinges?

[Leoshenlong]

After investigating the found antiques, I realized that the shouder guard and collar plates's hinge was very thin, even measuring only 0.5mm.  Ultrathin.  I'm sure it will fail because of the slash from the enemy.  it's too weak
I know the plates are joined by leather straps, but there are no leather straps that connect the 3 shoulder guards.  if the hinges is damaged, the shoulder guard will be deflected