Well, there's another thing that you must consider, in soldering components, that is very important ..... is the heat transfer rate of the leads of the components that you are soldering.
This is the main reason for which a good soldering iron must be able to transfer a lot of heat in a very short time to the soldering point, so the solder melt and "wet" the contact points quick, then you can take the soldering iron away and the whole thing start to cool fast .....
If instead you use a soldering iron too low power and too low temperature, you need to keep the soldering iron tip on the place for longer time, this cause a lot more heat transfer to the component, and if the component is a heat-sensitive one, you can burn it just soldering it.
With a high power CO2 laser like the one in the video, you can melt the rings of solder very fast ..... but using a relatively low power beam, say, 5W or similar, you need a lot more time, so once the solder is melted, also all the rest of the component is at the same temperature, and probably already damaged, if is not a resistor
