That's enough of an oversimplification as to not really be true. They developed an issue with explosive decompressions, because at the time we didn't fully und

That's enough of an oversimplification as to not really be true. They developed an issue with explosive decompressions, because at the time we didn't fully understand how cyclic stress caused metal fatigue. It is true that they had square-er windows than modern planes, but they knew that and added reinforcement. The stress concentrations inducing fatigue cracks were around square cutouts for an antenna, not the passenger windows. Also, the windows didn't pop out of their frames. Large portions of the fuselage ripped open. And they lived a longer service life after the fuselage was reinforced in the areas that cracks were starting, but had trouble overcoming their bad reputation from the earlier explosive decompressions. Source: the introduction to the Wikipedia article you linked. Read it.