Hmmm..As I recall, I.P.Ts morphed from the spambuzz term "Multi-Discipline Groups" around `86....
Even then, there were numerous `career pattern` inserts who had no idea WTF they were expected to talk about and spent most of their staff tours ducking & diving. I recall my branch Wg Cdr saying to me "Well, Mister OMS, I know you have given me a comprehensive brief on all of the issues and I`m sure you are right in your conclusions....However, I am posted next month, so I expect you to keep all the balls in the air till after I`ve gone"
I fear nothing changes much - except there are even fewer at the pointy (bottom) end of the triangle...