What a wonderful show of Western civilization and tolerance! Hitler should learn from you!
Actually, I happen to differ with Jukka on several aspects, like what is pro scanning, etc.
In this particular case I have to agree with him.
While Martin Pegg's book was groundbreaking on operational issues, it is not a monography of Hs 129. If the title was 'Hs 129 Panzerjaeger - an operational history', then perfectly OK.
Perhaps most of you are not interested in technical details, your choice. But your claim that because of that you find it boring, Jukka should not demand them, does not say very good about you.
You do not even find the difference between history enthusiast and aircraft enthusiast. This is a key difference, although none of the parts can be separated. That happens that the aircraft and its employment is combination of political, technical, tactical, and whatever you can imagine, reasons. See at Me 262 - there is a discussion if the delay was caused by political (Hitler) or technical (lack of proper engines) reasons, thus affecting further tactical use of the aircraft.
You do not like it, go on, but do not wrtite that you authored aircraft monographs and do not claim obvious technical nonsenses concerning eg. Soviet aircraft.
Finally for Denes. Hs 129s were captured by Americans, Britons and Soviets. There were certainly detailed technical descriptions. If there is no surviving performance data, it may be quite accuratelly calculated from another data.