I should have been more clear on the terminology - 50K URLs. Which doesn't always mean 50K posts or pages, but those plus all your taxonomy pages plus all your pagination pages. A 10K post or page site can give you 50K URLs pretty easily if it uses taxonomies and pagination.

My case might be unique where the site is being built at the end of a pipeline that sorts through millions of rows of data and gives you the content you want based on your filters, but it's honestly not difficult to get to 50K URLs for many sites that have some age on them.