Using the delete Keyword /w GC

[Etienne via Digitalmars-d-learn]

People have been saying for quite a long time not to use the `delete` 
keyword on GC-allocated pointers.

I've looked extensively through the code inside the engine and even made 
a few modifications on it/benchmarked it for weeks and I still can't see 
why it would be wrong. Wouldn't it help avoid collections and make a 
good hybrid of manual management/collected code? The free lists in the 
GC engine look quite convenient to use. Any ideas?