Its scary to someone who does not know. . They most likely overheat the boards and it goes down hill from there . Im sure we have done that right guys ?
But the tip is paramount , and few have a clue to that. I do hi temp quick solder jobs on RC stuff. 10 or 8 gauge attached to a tiny tip. It needs to be done quick and very hot . Both sides tinned of course.
When I was new, I used a small tip and low heat. It seemed logical to me at the time that you only want to melt the solder and not overheat your parts, and use a small tip so as to avoid kludging around with a bigger one. After about 2 hours of frustration trying to solder some wires, I got on Youtube and realized it was the opposite lol. You use high heat because you dont want to dwell on the joint, which will heat up the component, you can work faster, and a bigger tip just equates to better thermal mass and stability. There's a rare occasion that I switch out my 2mm chisel tip. It does nearly everything, when you know the proper technique.