Why disappointed? Because mobile platforms are not designed to do anything critical. Take for example this excerpt from the End User License Agreement of iOS 7:
The Tofino blog has a post by Bob Radvanovsky that is quite an important issue for many ICS owners and operators. I've seen internet-connected water control systems with my own eyes, and have reported everything from building management to electric substations directly connected to the internet to ICS-CERT, vendors, owners, and anybody who will listen.
It's a great irony to me that the blog post appears on Tofino's website. I have a great deal of respect for Tofino's hardware and software, but their overarching message concerning field device security is muddled. Eric Byres and other SCADA Apologists say that removing insecure-by-design field devices in favor of secure-by-design ones is simply impossible for asset owners.