[michaelhoffman]

It's not a little 20 line of code toy project. It's an engaging and accessible writeup of some basic parts of TCP that happens to include some easy-to-understand code.

It's pointless to people who understand how TCP works in depth, but the majority of programmers don't.

[peterwwillis]

It's an engaging and accessible writeup, true. Unfortunately, there are also several glaringly incorrect/misleading points in the article. The fact that it's getting upvoted is just..... strange.