Audemars Piguet

26331OR vs 15400ST. Bracelet is 50% thinner in gold and is hollowed out at the deployant clasp whereas the stainless bracelet is solid. ...  

I may be able to guess why, but does the thinner bracelet of the gold APs wear thinner?

Besides I do not think that the additional cost for the extra gold is an actual factor. I think that if we consider the actual cost of gold, the art of making it is what makes a Cartier gold ring, for example, more expensive than the corner no name jewelr... 

But I wonder whether it really wears differently due to the differences in bracelet thickness

Nothing to do with weight or wearability, other than an unintended secondary benefit.

Maybe a silly question as gold, despite being a softer metal, should still be sturdy at that thickness. But is the “sturdiness” or “robustness” of the bracelet negatively affected by the reduced thickness as compared to SS? BW, Chi Kai

At first I thought you were joking but then I saw the pictures. I can think of one or two reason why making it thinner could be justified ie if you wear gold it’s unlikely the watch will be out through same tough circumstances than steel so doesn’t have t... 

...it would be wholly unwearable unless you’re Shaq or Arnold. The watch is extremely heavy as is and I think it’s at the peak of its weight for wearability for an entire day. Many times I’m happy and relieved to take it off at night as it is so heavy. Co... 

Here you compare a steel RO 15400 to gold chrono. I wonder if the steel RO 15400 is compared to gold RO 15400 Thanks for pointing this out.?

One would think therefore that an even more robust bracelet would be appropriate to match the proportions of the case.