Turbine engine warm up is nothing new. Can you apply full thrust shortly after start up? Sure, but engine longevity is greatly increased by an adequate warmup period. Now, for all the EPR vs N1 arguments, a cold engine may very well benefit from an EPR setting due to input vs output pressure, but that doesn't account for any blade tip erosion. A cold engine setting TO thrust by N1 ain't gonna produce the required or anticipated thrust that a properly warmed up engine will.
For any relevant basis, I have only operated High bypass ratio engines. Never flown a turbo prop. However, I have a a lot of time flying BIG radial engines. Most of us are paid by the minute/hour. Why not make the engines more reliable? Why not reduce your real V1 failures
, hence your time in front of the long table with no ashtrays. All the big three engine manufactures recommend a 5 minute warm up before applying max thrust, at least on the big thrust engines.......some recommend 10 minutes if really nipply......