I congratulate moot for the job. 4chan's change over the years has been minimal. The biggest change was probably the captcha - initially it was a temporary fix to flooding and spam at the time, but it stayed since there doesn't seem to be an alternative. Those that use 4chan enough for the captcha to get annoying, the $20 yearly pass was a great way to get around it and to allow us to support the site as well.

Also the introduction of some of those boards was simply to get shitposts out of other boards (e.g. /soc/ was created to cleanup /b/ and /r9k/). Worked great.

However, I have to disagree with the sage thing. While originally the term was used to not bump a thread (implying that your own post was not worthy of bumping a thread back to the front page), in the last five years (and before that, to some extent) it HAS been used as a way to 'down vote' a thread.