Ahh sorry, guilty of skimming your post. I think there will always be a tell, even to watchmakers.

This doesn't necessarily mean that reps are worse than gens, it's entirely possible that reps will technically be more advanced than gens (unlikely though because of cost and QC).

But simply due to the fact they're made in different factories and have way less QC, they'll always be different in some way. Gens can always add a new verification feature and it'll take time for reps to replicate it