As per the text again in the real world of electrical work which I have been doing for 30 years you do have to work on a live fuse board now and again and anyone who has worked In a commercial or school environment will agree or just lie to go along with the people who " have never worked on anything live".. And yes to answer your question it does now mean that if I have to replace one of these items I will have to rethink how I go about this..
This is the reason I never post on these sites because I was trying to give a heads up to anyone who might be in a situation where they are replacing one I didn't want them to receive a shock like I did. But unfortunately most people on this site prefer to be argumentative and pick on the isolation side rather than actually pass on some info that might help someone..