[ajxs]

Something about these JS-heavy sites I haven't seen discussed: They don't archive well.

Websites that load a big JS bundle, then use that to fetch the actual page content don't get archived properly by The Wayback Machine. That might not be a problem for corporate content, but lots of interesting content has already been lost to time because of this.

[userbinator]

Depending on the site, unfortunately that might be interpreted as a feature and not a bug.