Chuck a site map at it and most of that bad boy will get indexed, in my experience.
It won't necessarily get indexed. I have a website with close to 50k pages. It's been hovering at around 10% indexing for close to 3 years.
Yes high page sites can be like that. I think internal/external backlinks can help there. Although not an SEO expert.
But can a SaaS that just indexes help you any better?
SEO is a slow game and backlinks are still king, as far as I know.
Let's see how the 2024 update changes things.