Hi MJ. I know the history of these developments, and your chosen description is superficially fair. Although the main argument here is not about the history of WW2 ECM, I offer a few thoughts on points that you raise. The decision to delay the use of Window was badly mistaken. By that time, the positive weight of disruption from its use was grossly in favour of the Allies. The Germans had realised this and they did not first use Duppel themselves because they correctly saw how they would suffer worse effects if its use started! So, stupidly, the British delayed the use of an effective countermeasure, and incurred huge losses, while the Germans developed their own countermeasures while still not suffering degredation of their defences in the meantime. Stupid, likewise, was the casual Allied EMCON.
OAP