Website crawlability is important for all keywords, not just long tail keywords. If search engines cannot reliably discover and access your pages, those pages cannot get indexed, and if they are not indexed, they cannot rank.
Crawlability is heavily influenced by internal linking. Search engine crawlers find new and important pages by following links, so pages that are buried deep in your site architecture or only reachable through weak navigation are easier to miss. This matters even more for long tail keywords because the pages targeting them are often deeper, like niche blog posts, supporting service pages, FAQs, or location specific subpages. If those pages are not connected clearly, they may take longer to be found, get crawled less often, or never get prioritized.
Backlinks also play a role. Sites that earn links tend to get crawled more because Google treats them as more authoritative and worth revisiting. To improve crawlability, make sure long tail pages are linked from established pages with authority, use anchor text that matches the topic, strengthen internal linking between related pages, keep navigation clean, and build backlinks when possible.