It would be useful to have the ability to lock views and sheets to prevent any accidental edits. I see this as a simple context menu item. Simply select view/sheet, right click and choose "lock" from the context menu. A padlock icon then appears next to the locked item.
Anyone who attempts to edit a locked view won't be able to do so. They will see the lock and that will, hopefully, cause them to think why it's been locked in the first place. And sometimes this feature will protect users from themselves.
By the way, this sort of functionality is common in many design applications so it's not like I'm inventing something new here 😉