What the browser authors like Google are doing is further hiding DNS from the user. Many years ago Firefox was already hiding and highlighting parts of urls in the address bars to "protect" users. It will only get worse.
I often navigate by first doing automated lookup using only non-recursive queries, then storing the address permanently until it changes (rarely does), and finally after I have the needed address, navigating to the url. I see every DNS answer, and thus I can see all CDN use.
Fastly has really emerged over recent years and is very popular among sites appearing on HN.
CDNs are popular but not all sites on HN or elsewhere use them. There are still many, many sites that do not use CDN's nor share IP addresses with other sites.