Importance of Crawl Budget for SEO
In order to rank your pages, Google needs to index them first. If the number of pages on your site exceeds the crawl budget, Google won't crawl them. Google has become advanced in crawling a large number of sites in a given timeframe.
Why Is Crawl Budget Important for SEO? In short: if Google doesn't index a page, it's not going to rank for anything. So if your number of pages exceed your site's crawl budget, you're going to have pages on your site that aren't indexed.