There’s a report now that an Indonesian naval ship has found metal on the ocean floor that may be the remains. That could certainly explain why they haven’t found the remains yet. It’s also said that if it did indeed crash into the ocean, the pieces could have drifted for hundreds of miles. Sheesh.
It sounds like investigators are now starting to wonder what happened even without the aircraft remains. Some are speculating that it happened quickly and involved either metal fatigue or a bomb. I assume these predictions are based on the lack of communications with air traffic control. If it were a more drawn out problem, they could have reported it, but that certainly doesn’t mean we can jump to conclusions yet