No offense, but please don't propagate the "net wisdom" that drinking highly purified water in and of itself is bad for you in any way. It's simply a logical impossibility that has been wildly extrapolated from the basic idea of "people need minerals, purified water has none" to the completely incorrect and laughable conclusion that "therefore, drinking highly purified water is bad for you".
You are correct that there is some concern over any source water that contains no disinfectants or a purification system that removes said disinfectants. However, the risk of this from an RODI system is no different than a "pure water" pitcher that removes chlorine/chloramine, living in a house that sources its water from a well, or drinking milk that's been open a few days in the refrigerator. In other words, the concern is mostly for individuals that have a compromised immune system.