Quantitative scales are all very well and good. Except that the numbers mean different things to different people.
Want to know how many pages a novel is? Well, how long is a piece of string? IT DEPENDS!
This is a trickier question than it used to be. But that’s a good thing!
If we really knew enough to know a translation was good, we wouldn’t NEED a translation, amirite?
Want to find out whether a particular work is in the public domain?