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ergonomics > safety guarantees
It is very much possible for you to fall when sweeping the floor, but how often do you? Or feel the need to lean against a wall? If cleaning the roof is made just as convenient, with a bit of diligence you wouldn't fall from it either. Neither would you poke your eye with a soldering iron, or drill into your own scull, not because it's impossible, but because the tools are easy for you to use properly. Instead of trying to build sophisticated all encompassing systems that allow you to ignore real problems, learn to tackle those problems comfortably and develop tools that make the solutions obvious.
