although i did not follow your points 100pc , i agree fully about what you are saying on ramus, and in fact the chin wing docs (i have met most of them) actually agree fully, the most aggressive of them told me she could do about 1cm widening, which would result in .7cm or so being visible, if you get the biggest of the shelf implants you can get more.
i have not once seen an example of a chin wing that has resulted in the patient having a wider, more masculine jaw. and i have check most of the focums and have specifically asked for this from the doctor.
there is no free lunch in life, if you want a wider, steeper jaw you will have to run the risks that come with having an implant, i think infection rate is around 10pc and that of permanent nerve damage is 5pc. personally it is a risk i am willing to take. i wonder if the doctors give you a discount in case he has to redo the surgery? could he reuse the implants? of the shelf they cost around 700 for the pair so it is not the end of world.
i think the more interesting discussions for us are of the shelf vs custom implants
i see the pro for custom mainly if you want to integrate the chin implant, if you have major asymmetry or extreme requirements.
the negative must clearly the cost, i think it is about 4k difference but do not have many data points, maybe people here have more.