As a linguistics nerd I'm pissed off by the existence of the Common language in RotE. Like...it doesn't make any sense
Frankly speaking, in the first three trilogies language stuff was done pretty neatly. We see that the Six Dutchies language (which has many regional accents) and the Outlandish language have the same mother language, but got separated after some time. Speakers of both languages can understand each other with some difficulties as some words changed their meaning or pronunciation. So it's something like an Englishman talking to a Dutchman. And it was soo cool and realistic
I did enjoy every mention of language learning stuff and translation, bits of information about Mountanian and Chalcedian languages
When the Common language was first mentioned in the Rwc, I thought it was called so because it was common for the Pirate Isles, Bingtown and Jamilia.
But then in Fitz and the Fool it was ruined: it turned out that Six Dutchies speak the same language as Bingtown and Jamalia, though they hardly ever interacted with each other for a very long time. Even if they had spoken one language centuries ago, it would have changed much more visible than Outlandish (that changed despite close trade). And they are not even bothered by accent!
I had a theory that the Common language could be an artificial language for communication like Latin had been used, but that means it had to be learned and I doubt that, for example, Persistence, a stable boy who couldn't read or write, had time to learn a language to easily communicate with folks in Kelsingra.
And it's especially funny that in Liveship Traders Clef, who was born in Six Dutchies, had a strong accent and when Fitz meets him in Assassin's Fate, he notices Clef's accent. Man, his accent is supposed to be because of your Native language!
Another bothering language thing is Clerres language (forgot its name). I enjoyed a brief mention of how the Fool tried to teach Fitz and others his language but... It was literally useless. When Bee arrived in Clerres, she had no difficulty understanding the Four and I doubt they spoke the Common, not their language, merely for a little girl to understand them (even they were not addressing her)

















