Dynamic Pages - Why Not Indexable?
User experience is important in SEO. So dynamic pages are not indexed by search engines due to bad experience for the searcher. UX has an impact on the Google brand reputation. So Google does not fetch the URL that are automatically generated.
Because Google doesn't trust on dynamic web page's content. In other words, Google hates dynamic results.
Don't think dynamic pages are fresh and they are good for Google. Because Google like freshness.
So focus on static pages that have value and linked with dynamic where it is useful for the searcher.
Note: Dynamic pages do not pass any link juice value to other pages.
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