I'm intruiged by the fact that some stringed instruments, like the ukulele, are traditionally tuned in the way of [reentrant tuning](https://en.wikipedia.org/wiki/Reentrant_tuning) where the strings are not ordered from the lowest to the highest pitch. 

I do not play ukulele, or a similar instrument, but on first sight this seems illogical. There must be, aside from historical reasons, a good practical reason for this style of tuning. What is it?