* V-Ray doesn't support the alshader, only alSurface. Arnold won't use alShader from version 5 and forward. Redshift doesn't use alShader, but can convert such materials to a degree.
* Arnold has a lot of people working on characters all day long, Indigo doesn't. That's probably a big contributing factor if there's a quality difference between the best skin renders from Indigo and Arnold.
* What do you know about Indigo's "Phong" material type and what reflection model it uses? As has been mentioned already, "Phong" is just a name for it - it's frequently being updated and improved, and this is the first time I've heard anyone complains about it. Phong *is* "good enough", and is probably a more physicslly correct material than an alShader, which containd a whole array of biased parameters that don't make sense in a physically correct renderer.
There's no Arnold hate. It's just a completely different concept, a fundamentally different rendering engine.
Indigo doesn't have a dedicated skin material type, although it's definitely achievable with Glossy transparent + SSS or the new FastSSS material type. How about you make a request for a good skin shader instead of suggesting we replace Indigo's material models, meticulously developed for 10+ years, with a biased and discontinued shading system from a different rendering engine?
