Ask HN: Practical examples of when you would need statefull webservers

Stateless webservers seem to be the most popular approach for many reasons. What are some common scenarios where it would be more ideal to use statefull webservers? Or can you make most things work with stateless webservers by moving the state client side and having some temporary state in your waf for security/rate limiting.

Edit: would keeping some state in the db be considered as statefull webservers? I don't think so. Basically, it doesn't matter what web server you connect to, the end result/experience is always the same.