D's greatest mistakes

[Jack]

The post "C#'s greatest mistakes" prompts/begs this post. Have at it, 
pick up the ball and run with it, don't be shy. I expect Walter and 
Andrei to answer (if Walter and Andrei so dare!) after others' posts have 
stopped or stagnated into that cesspool of threaded discussion that is 
"the subthread" or "tangential thread" (which surely needs a rock 
anthem).