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.
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Anyway, I'm looking to use the flash for the same type of shooting but in low light, at night, in winter...