The people who used the writing took the time to learn it, so it's not a "BS excuse". Your comment derided the system on a general level. From your point of vie

The people who used the writing took the time to learn it, so it's not a "BS excuse". Your comment derided the system on a general level. From your point of view it might not make sense to learn it, but not from the point of the historic users. Once you learned it, you see that the similarity of letters is only superficial and you can distinguish them quite nicely, especially with context. You actually start to recognise patterns. And since the system gives you only very few ways to deviate, these patterns are surprisingly uniform across different authors. I haven't seen that with other cursive systems to this extent. It becomes a bit harder though with writing from after the war, when people started to mix Latin into their Kurrent or Sütterlin.