Google said that it is a major concern if your most important page or pages are terrible, but it is less of a big deal if your less important page or pages are terrible. Therefore, it is not good for your website’s SEO if your home page is terrible, but you shouldn’t concern if your archived orphaned pages are terrible.
According to Google Search Advocate, John Mueller, on Mastodon:
“If a site’s most important page (say homepage) is “terrible” (in the sense of any algorithm), that’s a pretty big deal. If the same site has a random archived page that’s “terrible,” no big deal.”
It is always better to remove uncertainty. Thus, it is essential to optimize every indexed page’s SEO within your website for better ranking on search engines such as Google.