Nobody is implying anything before 2018 is obsolete, but that these libraries that the author is showing are still alive and well and actively maintained/improv

Nobody is implying anything before 2018 is obsolete, but that these libraries that the author is showing are still alive and well and actively maintained/improved. Sure, a js library from 2008 will still work great now, however it might not work well with new module bundlers, or it might do something that is consitered "code smell" in newer JS engines which could impact performance. Newer doesn't mean "better", but it's still useful information to have.