My big annoyance with GURPS has always been Imperial measurements. It's okay in pre-modern settings, but really jars in science based genres.
(Although, to be fair, SI units in a pre-modern setting are just as jarring.)
(Although decimal units as such aren't inherently an issue. The Ming dynasty used decimal units; their "inch" was roughly the same size as an Imperial inch, but their "foot" had ten of them. A fantasy setting that goes with ten knuckles to the Hilt is fine)
(Although, to be fair, SI units in a pre-modern setting are just as jarring.)
(Although decimal units as such aren't inherently an issue. The Ming dynasty used decimal units; their "inch" was roughly the same size as an Imperial inch, but their "foot" had ten of them. A fantasy setting that goes with ten knuckles to the Hilt is fine)
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