Locked door
The aircraft is built and designed fine. The relevant crash-worthiness requirements are complied with.
Yes, if you slam the airframe too hard it will break at some specific point first. If you crash-open the same type multiple times, it will disintegrate at the same locations across the hull. Really, there is no magic.
It's the most beaten and hardworking type of all aviation history, and there's absolutely no need to be paranoid.
The general consensus is, not surprisingly, that any impact energy consumed during the destructive deformation of materials is on the good side of survival effects as it is not transferred to occupants. As much as this does not prevent the ceiling panel from slicing one's head off.
It seems to be true, I agree, there are specific seat sections where the chances of walking out from a crash are higher than elsewhere. Well, for the Sukhoi at UUEE it worked exactly the other way, and not everyone has the chance to pick 0A/B.
No need to worry about the 737, really no. It would be a pity if, after 30 years of debunking the Toulouse grass-cutter myths and reaching a bit of a plateau there, we succumb to yet another name shaming contest.