Boeing 737-800 crash in China

I just recently watched Downfall on Netflix and that news aint helping me feel all warm and fuzzy about their 737-800/Max 8 series.

Has to be some sort of mechanical failure if the plane is in a full nosedive, no? I mean even with engine failure from 29k ft you can glide ( somewhat - im sure you haveto pitch the nose down to get air speed then level off - repeat )

ugh.

Didn't the 737 MAX have similar nosediving issues?