Well, one advantage of an ETA movement is that it is very reliable and easy for any watchmaker to work on.
Also, you could say many of the watches that use ETA movements are in house as well, since they are all owned by the Swatch Group.
The whole in house or not in house debate does not really mean much since most are just outsourcing thier parts through ETA and then modifiing and refining the movements. Just as Rolex outsources some of their parts.
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