I have the same set up x-t10 and 35mm 1.4. Last year I bought the 14mm 2.8 because I love wide angles and primes. I don't really need zooms for me as a hobby photographer. Why would you need the wr from the 16mm with your not wr camera?
I bought both kit lenses that came with the x-t10. I actually bought it so I could give my old x-e1 to my boyfriend, give him the lenses and in the hopes he will not need to use my prime lenses. But I tried them out and I adore the xc 50-230mm it's a beautiful lens for a very cheap price. Yes, it's all plastic but the image quality is still fuji. It does gives some blur when the subject moves too much and you try to zoom at more than 120 and you've low light. Don't expect it to preform like the more expensive lenses. Than after all you have less to worry with this lens if it would broke or something. There are better reviews out there than mine so I'll leave with just saying: look into it.