Significance of OP initiated log out

Hi, I found that RP initiated logout and OP initiated logout are the same process,but OP initiated logout does not need id_token_hint ,What’s the point of doing this?

Both parties need to be able to log out! The OP does not have access to the id_token, therefore it can not send it. There’s also a difference of behavior in the post_logout_redirect_uris as well as some other internals.