The same problem bit me multiple times when pretty-printing nested data structures. There's often an arbitrary limit to the depth the printer recurse to and/or the number of elements that get displayed, with the rest hidden behind "..." or something similar. No matter what number you pick, sooner or later you're going to get a case where you miss a really interesting/important piece of information because it got hidden. And if you try to change the default, you're going to get a case where you miss important info because you couldn't be bothered to scroll that far up...
Anyway: you're right, this is bad, but also pretty common. Though in this particular case it's really bad, because most of the column width is taken by irrelevant data. Replacing `<function '` with λ would already help a lot.