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The wire that came with mine was pretty thin. I had read from another owner that under heavy load it became warm to the touch so I upgraded it. It might not have been necessary but it couldn't hurt. As for tinning the ends of the wires, I don't personally see that helping in the least. If anything it would decrease the bite on the wire by the screw connector.
Having said that, I think we are all guilty of thinking we are experts and spouting whatever nonsense we read or our skewed opinion based on limited experience. I've seen some questionable opinions being spouted on the Facebook group and sure enough they get repeated over and over as fact. So take my opinion with a grain of salt...