The ( quite good ) report goes in great details to explain certain things but pass very fast on others.
Some of them I would like to have seen mentionned :
The name RA for "Resolution Advisory " was choosen by the FAA to limit the liability of the US manufacturer of the Software ( The Mitre Corporation ) Only in the US was it known implicitely that although for legal reason we call it an advisory, it is in fact a command .
Unfortunately when you translate the manuals and the procedures in other languages, Advisories remain advisories.
TCAS was made by the US for the US... (on one of its first report Eurocontrol mentionned that TCAS II logic behaved badly in European types of en-route airspace...)
To follow an RA you need to be 2 in the cockpit : one that look outside to identify the intruder, the other that look at the display and follow the needle to keep it in the green.
Attempting to do both at the same time results in large deviations...
The 757 pilot was alone for a great part of the RA..( I do not believe this played a role in this case , but it show us that Murphy' s law is always valid...)
The unsheduled late inbound to to Friedrichshafen was, from an ATC point of view the most important link of the chain of event that led to this collision.
The paramount importance of this fact is missing
This forced the controller to look into two different scopes a few meters appart, and monitor alone two different active fequencies whit degraded telephone system and faulty back ups. This led to the late detection of the conflict and the late decent clearance to the TU.( which was the action most controllers would have taken since the TU was pllanned and coordinated with the adjacent centre at 350 and the DHL had just reached his cruising altitude ) .
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Various Management levels put the controller into that position that night. This later also cost him his life.
Finally to "Die Skyguide" : first post and already full of hate..
For info in most ATC centres at night before that day, SMOP was either planned by Management ( still is in some places, especially in TWR-APP )or at least tolerated.