While preparing modules for sale, it became clear that some of the lettering and graphics on the faceplates scratched off too easily. A few tests confirmed the problem: the silkscreening was not solid enough to hold up under long-term use.
That kind of issue is easy to dismiss if the only thing that matters is sound, but modular users tend to care about the physical finish of their instruments as much as the circuits. A weak faceplate finish means a weak product, even if the electronics are right.