Yeah, a moving part that can't be checked... but the one I saw had a fairly substantial bearing that will see very little load... will hardly move much at all... just gently sway back and forth with g-forces... and oiling shouldn't be an issue
Actually I think the water is sucked back down through the turbo into the engine... but the effect is the same... turbo continues to have water flowing after engine shutdown. Thermosyphon. Early engines used it for cooling all the time... no pumps were used.
Everyone is entitled to their own opinion.
But everything would fail with a high impact.
I don't think there is much to discuss, all of these have been successful in high horsepower applications.