Two reasons: The XA4 is pocketable, and I already get good results. I take it out on my lunch hour and often visit (some might say) dubious areas. My subjects are walls, signs, poles, litter, etc. I won't be lugging a view camera or even an SLR around. But it's not a hindrance. On the XA4 I dial the focus all the way down to 1 (foot) and use the camera's wrist strap to measure distance. Dead on. And easy to correct for parallax.
Anyway, I'm looking to use the flash for the same type of shooting but in low light, at night, in winter...