I know what you mean. I think there must be a better way to represent the various states than using up so much horizontal space in the outliner. Having said that, I don’t know a better way to show the states at glance and allow toggling easily. Might be nice to have an option to collapse the icons into a context menu and show that something is invisible or disabled with shading on the text if the user has this enabled.
I really don’t think an isolate icon is needed for the outliner, but it might be worth having an isolate button on the viewport controls panel that works on the selection.
What is the monitor icon for?