I believe it helps with new components, of a nylon based material and the process of placing the parts in boiling water allows the part to take on some moisture - normalising the parts and potentially making them tougher. You don't need to have them simmering away, just boil the water, drop the parts in and let the whole lot cool down together. 20-30 mins. Parts will be cooled evenly this way.
Parts will absorb moisture from the air in time anyhow, hence it's mainly something you might do to new parts / wheels etc.
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