Because TFS was written by a marketer, there's no hint of what this magical technology might be good for. Except for the fact that it's Windows 10, which was also written by marketers.
Apparently switching SIMs (typically while traveling abroad) is so much trouble that "they", out of their boundless kindness no doubt, have a "solution" for you: reprogram it remotely so you could switch mobile carriers just by going to the settings page on your smartphone. Me? I'd rather trust my fat fingers than some company or some service that might work as advertised or not, thank you very much.
Incidentally, Apple has been talking about this for a while -- another reason to steer clear of it.