XFinity has been terrible lately, and I have a Starlink Mini. XFinity failed today, and I did fallback for a few hours on the Mini. Connectivity was actually better than fiber. If only it worked when it is cloudy -- for $50 on roaming, that's a no-brainer given the exorbitant cost of living in northern cal.
I have never noticed an issue but now that we’re talking about it I realize It’s never occurred to me to run a speed test during a heavy downpour. Which might tell you something positive by itself. Next time I will do so but it might be a while; my rain season has ended.