The whole replacement plug myth is alive & well in this country too. The instructions with almost all appliances in the UK actually come with detailed instructions on how to remove any fitted plug the appliance may have and how to replace it with the correct type if necessary. Mostly plugs are only removed if the get damaged, which happens a lot on power tools, vacuum cleaners, lawn mowers, and so on and so forth, or on kitchen appliances where the mains lead needs to be passed through a gap or hole in a kitchen unit or surface to reach the socket.
As for the light on the switch on the Electrolux 504, the fact that it goes out when the switch is pressed may well be described as a feature in the booklet, but the truth of the matter is that it's a consequence of having the lamp in the switch and not really a feature at all. This is the only way a lamp could be fitted to the cleaner without making a change to the existing mouldings, and the neon lamp sits across the two live terminals of the switch. When the switch contacts are broken (that is to say the switch is off) there is current flowing through the neon, down the live connection to the motor, and around the cleaner, then back out down the neutral wire, and vice-versa, such is A.C. current. This causes the neon to illuminate. Pressing the switch by-passes the neon altogether and it goes out.
It is my own opinion that the neon is there as a very cheap way of making the cleaner look that little bit more fancy. Upon using her 504 for the very first time, my mothers exact words were "Well what is the point of that?" when she switched the machine on and the lamp went out. In spite of this, she liked the cleaner very much. As I am sure we are all aware of, the Automatic 330 and 345 cylinder cleaners did exactly the same with the neon lamp, using the bag full lamp as a way of indicating that the power was on. The fact that it would illuminate when the cleaner was switched off, irrespective of how full or empty the bag may have been was rather short-sighted and confusing I felt. I think the lamp should have had no writing against it at all, or words to the effect that it indicated both power to the cleaner and a full bag, or have had two separate indicators to demonstrate the current status of the cleaner.