I'm not terribly bothered by Sagani's accent. While Boreal dwarves are Inuit-inspired, they aren't strictly Inuit copy-and-pasted. Pillars is still (at the end of the day) a fictional fantasy setting with fictional fantasy locations, so they can pick and choose which real-world inspiration to draw from and which to leave alone.
Besides, I felt the voice actress they picked for her was just so great and portrayed her so well that that supersedes a "foreign-sounding accent." If they happen to find actors or actresses to portray Boreal dwarves in the future with Inuit-sounding accents and portray the individual character very well, I'm all for it. For the mean time, I'd rather an actress who portrays Sagani perfectly without the accent than an actress who portrays her so-so but in an Inuit (or generic "foreign/Native American-sounding") accent.
Fae, I guess to me, it's the reverse. Without the accent, all the rest falls flat on its face. It's like having an excellent actor in a movie who generally does a good job of portraying the character well and delivers the lines skillfully, but has to work with otherwise bad material.
The voice actress who did Sagani may have done her job in a professional manner and delivered the lines well. But without the accent, it's maybe like a really profession actor delivering lines well but is in really bad costumes. (I'm sorry if my attempts at analogies may not be working, but I hope you get the point I'm trying to make.) Or put another way, one might have thought that Kevin Costner when he played Robin Hood back in the 90's delivered his lines professionally. But without a good english accent, to many people Costner seemed utterly out of place as Robin Hood, no matter how well (or not) he might have done otherwise.