An IQ of 100 is defined as the median IQ level for a population. The range between 90 and 130 covers the whole gamut of human intelligence that's commonly considered normal.

Much of the day-to-day work in IT often doesn't need original thinking but merely skillful application of known methods and patterns, which in turn doesn't require a college education.

In my opinion, full stack and DevOps is the normal, sane way of approaching software development. Artificially dividing up roles into labels such as 'front-end', 'back-end', 'database programmer', 'system administrator' only leads to more silos, less collaboration and sometimes even downright hostility between these roles.