Interesting point, and I agree with you...but, I also think it's critical to explain in detail what you want/ don't want to happen when you have your watch serviced. 99.5% of people would be delighted to have their old movement swapped out for a new one, and probably see it as great customer service.
You and I want the old movement, with it's original rotor and column wheel design, so we need to tell whoever services the watch that's what we want. Whenever I have a vintage Heuer serviced, I always ask for the old parts back...most people couldn't care less.
You're right that the movements aren't marked to a particular serial number, even though the watch is (in two places...which is why polishing out the serial number of the back of the case is pointless!). I like the idea, but it wouldn't be easy to implement, because in the current production process the case and case-back and finished (including engraving) and then the movement is fitted with dial/ hands. They would have to find a way of getting around that.
The other issue would be with delivered movements from ETA/ Sellita. I believe that these are covered by warranty if they are fitted to the watch, but if TAG Heuer took them out and then engraved them with a number, that might be harder. Still, it's a good idea...
dc
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