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I have some cute little pieces of solder shaped like springs that you slide over the old part stub and the new part lead to do the soldering. I have never used them but they should make it a little easier.
I suspect the reason for suggesting not desoldering a part is to avoid overheating the board.
An Admiral table radio of the early 1960s used the 'new' circuit boards. To alleviate consumer concerns, the warranty said that the board was warranted for a lifetime. However, the warranty did not cover the parts on the board nor the labor. While anyone with a bit of understanding could see through that, it was obvious they were scamming. The cost of the board is trivial compared to the other costs. It gave new support for the idea that the big companies are NOT out for your good.
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