Even Lange doesn't develop one movement per watch, if you take the example of the Langematik movement, which you find in the simple " Langematik " as well as in the Wempe LE ( Power Reserve indicator ) and in the Langematik Perpetual ( QP module ).
But I find that it is more intresting, when you collect watches from brands like Patek or Lange, to have watches with different movements.
Back to the Celestial, I know that it is a bit irrealistic, in terms of economics, to develop a movement for a specific watch and for it only, but:
1/ Didn't Patek do it with some of their watches? For Example, the movement of the 5100: Was this movement used in another watch? AFAIK, not.
2/ If they did so for a watch which was retailed under 30 000 Euros, they could do the same for a watch which was around 160 000 Euros several years ago.
3/ Why not going for a better finishing of a same movement, for such an expensive watch, as is the Celestial?
A 200 00 K Euros watch which is considered a crossing borders by its own brand... I was on to spit my 5 o' clok tea on my keyboard!
Best, my friend. It is always a pleasure to read you.
Nicolas.