Can I ask what sort of detail you are referring to? In a watch like this, the main reason for going "in-house" (whatever that really means) is for the sake of exclusivity. The main complaint of people who typically hold the view that ETA makes a watch less valuable is that the movements are common. Common doesn't mean inferior, and uncommon doesn't mean better in any way.
The ETA 2824-2 comes in COSC grade, so if Rolex wanted to, theycould have had the ETA version made COSC, but my feeling is they would not want to advertise that someone else's movement can be as accurate as theirs is by putting the best version in their watches. In fact even non-COSC grade 2824-2's can be made to run well within the commonly accepted COSC requirements with not a lot of effort.
I don't know a ton about the new Tudor movements, and in fact no one really will other than Rolex. The reason is that no one will be servicing these, even the Rolex service centers. If there is a problem with the movement, or its due for servicing, the whole movement gets swapped. The old movements are sent back to the factory and serviced there, and then sent back out to be swapped into other watches. This is an increasing method of "service" in the industry.
This means that no spare parts will leave the factory, so there will be no channels for spares to get to the open market. You would be captive to Rolex for servicing in perpetuity. For that reason alone, the "in-house" movement version is worth a lot less to me personally, and I think many will feel this way as time goes on and they discover the service restrictions (I doubt they tell you this when you buy the watch). Now if you are the type who uses the factory for service anyway, this may mean nothing to you, but for many they don't want to use factory service, so it will be an ugly surprise when they find out their trusted watchmaker can't service the watch...
Cheers, Al
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