My family has a harpsichord, so I've learned a fair amount about it, though I'm not the one who plays it.

Harpsichords went out of tune easily and quickly, so they had to be tuned at least as often as every performance.

The way I look at it, a musical scale is a technology. Often, a particular technology is chosen because it solves multiple problems with acceptable compromises. A problem for the harpsichord is that the musician has to tune it themselves, often quickly, to make it sound good enough for a performance.

We don't attempt equal temperament on the thing.