A wider range would be better, but the product would certainly be more expensive. The wider the frequency range, the more difficult the RF design. Receiver technlogy in this band is very common and hence very cheap; I can't speak for transmitter technology, of course.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.