Ive had multiple osteotomies on my face, probably more than most people here. By now I know very well how procedures look on paper vs how they end up in real life. I will reinstate that 1cm should be always the minimal aim for any significant movement. I would advise anyone to not get downtalked into small movements by surgeons if you want to see results. Except its something like what kavan pointed out or whatever. I would still pressure to get bigger movements, 2mm can easily be lost on bone resorption and displacement alone.
It absolutely does and will not. Its barely even noticeable on CT, let alone in real life under all the soft tissue adaption. Average male head size is 23x20cm, 2mm of 200mm is a 1% change. Its gonna do f**k all for aesthetics really
there is no magic number, but the movements needed to provide aesthetic improvement are tied to the facial/head size which are more or less similar among most people.
anyway what you provided sheds another light to the discussion. You are alot more educated on this matter so I will just take this as fact in this context. If you are already getting operated on you might go with "only the 2mm". But dont expect those 2mm to have noticible aesthetic improvements, thats what I can testament.
You would need to read the OP's past posts and look at his cephs if he still has them up. You can't apply your OWN face/chin situation to someone elses you have not taken the time to evaluate, especially to someone who is overly concerned about getting a LONG chin with the surgery. So, basically, you told someone who is afraid of getting a long point chin to go for at least 10mm. If he followed your advice, he'd end up with a DEFORMED looking chin. OK.
The OP has a history of confusing himself and being 'on wrong side of door' as to displacement proposals. On one hand, he wants 'more'. But on the other hand if that's proposed, he gets afraid his chin will be too long or 'pointy'.
MOST of his advancement is with the BSSO which will bring his chin forward along the vector of the BSSO. But BECAUSE he has a LOW MPA, his CHIN needs to come a little bit more DOWN than the BSSO will take someone's chin with a LOW MPA.
The 1mm he's concerned will not be 'enough' is basically the amount needed to bring his chin DOWN by 2mm. It's NEEDED for a modest DIAGONALLY DOWNWARD genio so his chin does not remain STILL TOO SHORT even with the BSSO and also needed to increase his OVERLY ACUTE groove between the lower lip and chin. If he didn't get the 1mm to bring the chin vertically down by 2mm, his chin would look weird with a straight down 2mm drop.
So, please NOTE that the OP is a CONFUSION GENERATOR and probably confused a good handful of people on here, including himself by leading people to believe the 1mm he was worried about 'not being enough' was with the sole goal of just ADVANCEMENT whereas the 1mm is NOT toward that goal. It's toward the goal of providing a MODEST increase in chin length where the chin is to be moved in a DIAGONALLY DOWNWARD direction.