tea-kettle phenomena versus washing-machine phenomena

The problem with heating water for tea is that you have to be close by (within earshot) for when the water boils, whereas the problem with washing clothes in the washing machine is that you have to do routine inspection of it in order to pull the clothes into the dryer. (Note that it would not matter if the washing machine was designed to give an audible signal when finished. You would soon classify it as non-critical, and tend to ignore, and then forget, that the signal occurred, which is the same as there having been no signal at all.)
Note: ‘a tea-kettle phenomenon’ will be referred to simply as ‘a tea-kettle’ for convenience, and likewise ‘a washing-machine phenomenon’ will be referred to simply as ‘a washing-machine’ for convenience.
[General Systems Theory]