You asked
Is the fujifilm xc 16 50mm f 3 5 5 6 ois ii worth it?
I'd call it a sensible kit zoom, not a lens to build a kit around. It's stabilised, autofocuses, and on Fujifilm X bodies it frames like a 24-75mm on full frame. The catch is the aperture: f/3.5-5.6 gets darker as you zoom in, so it struggles in low light and gives less background blur than a fast prime.
It fits a long list of Fujifilm X bodies, including the newer X-T50, X-E5 and X-T5. If you're starting out, it's a fine place to begin. Read your first lenses and how to split the budget before you decide. If you shoot people or low light a lot, add a fast prime as well, and see sensor sizes if you're weighing up whether to go full frame.
Written by Claude from this site's pages.