Article resume: biggest cs problem now is a diversity of serialization formats, because most of current code consist of parsing various formats, so OS must to do something about it.
No, it is not a so big problem. And no it will not do our life easier. Also author did not mention about the real problem of semantic. How client should interpret a structure to compose a valid request.
OS should not know about userspace structures because OS don't do anything with it. It stores and transfers chunks of bytes and its semantic is defined by userspace. And forcing current popular serializing format on OS level is the most dumb idea ever.