Even with CWV as a significant ranking factor, content and relevance still matter, even for "slow" sites.
According to John Mueller’s response from February 26th, 2021, to a question about the influence of Core Web Vitals on search results:
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"RELEVANCE IS STILL, BY FAR, MUCH MORE IMPORTANT. So just because your website is faster with regards to the Core Web Vitals than some competitor’s doesn’t necessarily mean that, come May, you will jump to position number one in the search results. ...a really fast website might be one that’s completely empty. But that’s not very useful for users. So it’s useful to keep that in mind when it comes to Core Web Vitals."
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In my view...
There are many reasons why some websites may score less favourably for CWV - not all reasons necessarily being "poor design" or inferior hosting quality.
While there are various "current popular templates" (the new responsive cookie cutter styles), some web designers balance more than just rapid rendering.
There are intentions of distributing processing burden between servers and client machines to reduce server CPU demands.
There are intentions of sharing highly dynamic components of any given page, by deploying them as a series of separate small payloads. This may result in longer aggregate load times, but not anywhere near as much as any adsense-based or nsa/analytics website often involves.
There are intentions of incorporating multi-levelled obfuscation through design to help protect the rendered pages from being easily scraped. This might not stop attempts to scrape content-rich sites, but it makes these attempts clearly visible in server logs and take enough "sniffing" hits to firewall chronic offenders.
And finally, not all websites are in their "final" design/implementation state. While Rapid Application Development may facilitate blasting out massive infrastructures, when something significant like a core update comes along, development priorities may shift to address urgent deficiencies - or not.
The only efforts that seem to make sense until Core Update 2022 is done, and has settled, is to keep creating rich original content.
