Datatypes. Didn't design it for streams though...
Library version handling. You gotta hate unix version xxx.yyy.zzz forced exact version matches to use this or that program. Too bad the implementation of the libraries interface wasn't all that good.
Copper. So simple and yet so perfect. And then they omit making blitterlists... (the copper should never had access to the blitter - that should have been the job of a blitterlist processor)
