I grafted a Fuji onto a seedling this spring. It grew out well and I had no issues until late summer. I think I got fire blight on three branches, they just started to turn brown at the very tip , and continue to brown and die back toward the main trunk. I pruned all three off. Don’t no for sure if it was fire blight but it seemed to really affect the branches it started on.
I had a number of trees hit with fire blight this year. Fuji was not unscathed but relatively fared better than many others (I’d characterize it as a minor strike). I was able to keep it under control with pruning as @Derby42 mentions.
From my experience, I would not refrain from getting ‘Fuji’ on account of fireblight.
I did not spray last year for fireblight.