I am raising this question as a follow up to my previous (already answered) question: SEO Safe way to permanently delete thousands of outdated pages
Now we are planning to remove about 25% of pages. These pages will be returning 410 status with user-friendly content (with a link to the home page and a message saying that the page has expired). I believe search engines will take some time to de-index the pages that return 410. (Though the time will be shorter than 404 statuses, I believe there will be some grace period or at least natural technical delay by search engines). During the time between pages removed from the server and de-indexing by search engines, what if users try to land on those pages? Will such pages affect the user experience and SEO of the entire domain in general?