"Spout"! If I'd have been able to remember that word, this post would have been much more comprehensible.
Perhaps this is a Sapir-Whorf thing, but I generally want either cold water for drinking and handwashing, or hot water for cleaning things. For dishwashing, in which the water must be hot enough to clean plates but not hot enough to scald my hands, I'm filling a basin anyway so a single tap brings no advantage. I will happily make an exception for showers: a single temperature-controllable nozzle is clearly the Right Thing there.
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Perhaps this is a Sapir-Whorf thing, but I generally want either cold water for drinking and handwashing, or hot water for cleaning things. For dishwashing, in which the water must be hot enough to clean plates but not hot enough to scald my hands, I'm filling a basin anyway so a single tap brings no advantage. I will happily make an exception for showers: a single temperature-controllable nozzle is clearly the Right Thing there.