I've recently noticed that I've bookmarked quite a few threads so I thought I'd delete the bookmarked threads from my list. But for each thread it asks if I'm sure, doubling the number of clicks. It doesn't do this if I go to delete a thread from my watch list.
Could they both work the same so that you don't need to confirm.
Given my earliest bookmarks are from 2014 and the thread hasn't been updated for 11 years I think asking for confirmation is a tad excessive.
In an ideal world I'd like to be able to delete a load in one go.