YES!
In helping someone manage his lists, it was a process (and not at all intuitive) to find the option to "un-bookmark" an item. A "remove item from list" button or a working "delete" button would be most helpful.

At first glance, I thought it was as easy as clicking on the bookmark icon at the top right of the catalog page (when logged in). Selecting the item and clicking the remove button at the bottom. That did not seem to cause any action at all. There was also a delete (trash can) icon next to each item, and that did not do anything either.
When we went into the list through the link along the left of the account page, there did not appear to be any means of removing list items from there.
Viewing the item to toggle the "bookmark" icon off makes sense, but not as the ONLY option for removing a book from the list.

Agreed- having the option to manage should be in all views.

When looking at All Available in the new bookshelf feature, the only option for selected items is to Place Holds.

But when you are within a list, you can select items and also Add to Lists or Remove from List. People are used to those options, and it would be especially useful to have a Remove button to quickly un-bookmark titles while looking at the All Available view.

For people who don’t create multiple lists, and just use For Later, it's unintuitive to exit out of All Available and scroll down to the list in order to remove bookmarks. We have a staff member whose workflow was to select multiple titles, place holds, then remove the bookmarks. In the new view, the remove option wasn't where they expected it to be.