Comment by amiga386

I suspect he means the choices of putting the central directory headers at the end of the file, as well as having local file headers as you read through the file, which allows for ambiguity.

Alternatively, he could mean that, for the purposes of archiving, ZIP is very far behind the state of the art (no solid compression, old algorithms, small windows, file size limits without the ZIP64 extensions, and so on, most of which are not relevant to using ZIP as a container format)