My take on this is that most modern watches are bought by non-WIS types and as such they won't be concerned by originality so they will, most likely, throw away the replaced parts, sell them on eBay or lose them over time. In 30 years time, the latest crop of WIS will curse them for doing that - just as we do now with the watches we look at buying.
If I was Al (and he's very lucky that I'm not) I would be tempted to ask the client if they want the replaced parts returned to them as the photo-documentary he gives them would demonstrate that the parts have indeed been replaced. I know that this might present storage problems but it would provide a treasure trove for generations to come. Think of all those used but original hands dials, crowns and pushers - obviously worn movement parts are bugger all use to man nor beast, but the cosmetic parts.......
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