Hey Mr. C,
Aren't you at a HIDOE school? Well I don't know of any state policy on "device agnostic" and if there was one, I for one would certainly stand against that. I am not saying that isn't a great way for developers to make games and programs, but I think to only rely on that is short sighted and misguided.
It once again sounds like what is easiest for IT and not what is best for the students.
Also, I don't think principals would allow a mandate like that.
MisterA