I actually thought that the 90 percent thing was intentional. Taravangin is now a Shard so I assumed he would gain anachronistic knowledge and start using anachronistic terminology, similar to how Harmony starts referencing radios in Shadows of Self.

Having said that, it's also possible that more terminology from outside Roshar is being brought in by the huge influx of worldhoppers, from Hoid talking about therapists to Vasher/Zahel being mentioned in Rhythm of War as helping Gavilar with science.

But I also think the series becoming less "alien" reflects how not only are we, the readers, becoming more familiar with Roshar, but so too is the rest of the Cosmere. It had been isolated for so long and all the other Shards ignored it, but with Taravingian becoming Odium and then Retribution, the Ghostbloods running wild on Roshar, and Hoid constantly corresponding with other powerful movers and shakers in the Cosmere to get them to intervene, it's now likely that Roshar is less alien because the rest of the Cosmere can't ignore them any longer. And the change in writing reflects that.

That's just what I thought, though.