I know and use both systems frequently. On scientific and mathematical matters, yeah, metric has a huge leg up being base 10 and all. Other times I just have to side with standard. An inch is just about the length of that middle bone in one of your fingers? A foot is, well, a foot? Seems a bit more practical, easy to learn, and intuitive. Plus 22 celsius is way more vague than 75 degrees fahrenheit (or whatever that comes to)
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Hattusa: The Sensible Diplomat