I think it's similar to PHP, they're criticized by the vocal newbies who are chasing the newest and shiniest.
For me personally, w3schools has been one of the most reliable sources of reliable solutions that work not just for the latest Chrome build but across many different browsers and platforms.
Given the cumulative nature of HTML, "outdated" is another word for "reliable and established", IMO.
I don't see how MDN is a healthy meal when they document only shit which works exclusively in Chrome and Firefox, while claiming everything else is "deprecated" and ignoring all other browsers.
For me personally, w3schools has been one of the most reliable sources of reliable solutions that work not just for the latest Chrome build but across many different browsers and platforms.
Given the cumulative nature of HTML, "outdated" is another word for "reliable and established", IMO.