I'd rather fly on a plane that from a manufacturer whose planes might have foreign objects in the fuel tanks than a manufacturer whose planes definitely do have foreign objects in the fuel tanks.

If there’s a systemic problem that involves issues manufacturing a plane, it’s highly unlikely that it only involves one single type of plane.

There isn't though. Evidence for that is Boeing itself - for decades they made excellent planes that had very few problems. The 747 was the safest and most popular plane in the world for years. Boeing have made more than 1000 of them and there have been very few crashes, and most of those have been pilot error or external factors.

Something at Boeing has changed, and that has made some of their newer planes less safe. That tells you nothing about other manufacturers.