[pje]

"Imperfect" tunings are pretty common even in western musical instruments.

Fender Rhodes and Wurlitzer electric pianos, for example, which are staples of pop and jazz, usually use what's called Stretch Tuning, wherein notes an octave apart are just slightly higher than 2:1 frequency ratios.

https://en.wikipedia.org/wiki/Stretched_tuning

[denotational]

A “normal” piano with strings uses stretch tuning too.