Personally, I think 32 bits is enough for any application I'd care to run. If you need more than a few GB of memory, IMO the application is being ridiculously wasteful. But YMMV -- if some people think it's fun to debug 16-digit hexadecimal numbers, I'll quote Mr. Knightly: "I have nothing to say against it, but that they shall not choose pleasures for me."
IMO 64 bits is for mainframe operating systems. For my personal use, I prefer something... well, more personal.
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. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.