The modern view of galaxy evolution links gas availability to star formation, with the depletion / removal of gas seen as the end of a galaxy's active life. However, about 10% of local spirals are gas rich, yet host little star formation. The paradox presented by these "classical low surface brightness (LSB) spirals" tests the limits of our knowledge of star formation. I will highlight results from a deep multi-instrument campaign aimed at characterizing star formation in nearby LSB spirals, with an eye toward the anticipated results from observatories like HWO and Roman.