The DeFrancq news is unsettling, especially as someone who has consulted with him and was planning on going forward with a procedure with him. Any reason in particular you guys think he doesn't have an aesthetic eye? From his morphs he seemed to know what he was doing. Also, what aspect of the implant came out poorly for your friend? Was it too big, too small etc?
He probably does have some level of easthetic eye, but he's not completely specialized in implants yet it seems (he's probably working on that). He's done tons of other procedures, but jaw implants and wrap around implants are a relatively new procedure, especially in Europe, certainly with PEEK. You need aesthetic eye + experience. You need both.
Also, detached masseters is a soft tissue problem and this requires high level skills to partially fix. It's a s**t problem if it's too much, the only one I know specialized in that problem is dr. Y.
That being said, one of the users on this forum had a decent result with Defranq and showed his pics, although he also complained about a partially detached masseter at one side. So this seems to be a more common problem. Implants put alot of pressure on the masseter muscles it seems.
This whole business with implants is partially a trial and error business. The ideal outcome is raisor sharp jawangles, which fillers seem to provide lately. We're not there yet with implants I think, but I've seen good results even with current techniques and designs, depending on the surgeon.
Beauty is about millimeters. I agree the design must be exactly the right one, depending on the face. This is partially mathematics, but you just have to 'see' it. Only the artist can see it. And secondly, you have to know what you have to do during surgery. That's a technical problem. 1.5 millimeter too much on the design can easily become way too much in real life (inverse is also true). It depends on face and phenotype. Phenotype plays a role, asian men for example do the inverse: boneshaving. You cannot always put an 8 millimeter thick implant on an asian face, it' might look ridiculous. On a caucasian face, it's probably easier. On an arabic face, you risk making the face bloated due to oval shape facial structure in some cases. Many factors play a role.
And then you just deal with taste. Defranq seems to like masculinity, Yaremchuck wants more of a combination of masculinity and softness, which I think is ideal. Eppley seems to like over the top outcomes (maybe it's his taste?).