Apple’s latest smart device, the Apple Watch, may not include some of its originally planned health monitoring features at all, according to unnamed sources cited by the Wall Street Journal. Those sources told the newspaper that features—like blood-pressure, heart activity and stress monitoring—did not work reliably, were too complex or would have “prompted unwanted regulatory oversight,” WSJ wrote, adding that the project became known  as a “black hole” to some involved with it. According to the Journal, Apple was ultimately dissatisfied with its health sensor software: the technology was reportedly inconsistent and would change based on people with hairy arms vs. dry skin or how tightly the watch was fastened to their forearm. One health-related feature to survive—pulse monitoring. Market intelligence firm ABI research estimates that Apple will sell 11.8 million Apple Watches by 2015.