Using last year's setting doesn't not necessarily mean not developing the bike. If you have been following Alex_Briggs on twitter long enough, he has very well explained the things they do in "setting up" the bike (will try to dig in and post those tweets later)
Most of it I don't remember but He talked about the setting being the three corners of a triangle of 1 the Rider 2 the CG of the bike and something else (sorry about forgetting it
)But my point is going back to old setting doesn't mean "undeveloping" the bike.
Developing the bike is done by the factory engineers. The team and the rider would then work on the bike to make it best suitable to the rider and in this process collecting all the data and then giving feedback to the engineers so that the engineers can come up with a better bike (engine, chassis, etc).
Now who passes on the information, back to the factory, well is the actual debate.
Edit: Okay got the tweets. It is about adjusting the balance of the bike:






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