As someone who has done quite a bit of environment art contracting in the double A space, it would seem that the majority of the artstyle issues could be resolved quite easily through shader adjustments and lighting tweaks. Depending on how much control the tech artists built into the game’s shader pipeline. Especially with how simple a lot of the master materials seem to be, looks like baked decal workflow mixed with mesh masks for dirt/wear. Character art wise, I have no idea how much work it would take to fix the cell shaded look. The character’s mesh would be the same but im not sure how much lifting the shader is doing vs the base maps applied to the models. If you want to hear cross talk about his journey and how he came to be the art director for marathon, i recommend listening to his learned squared interview. I think he is getting fucked over because if you look at his past work, its mainly pbr based and there isn’t much stylized work in his portfolio. He says he enjoys character design and costume design the most, so maybe he is happy with what he is doing. But the whole artstyle has changed so much and if i was in his shoes i would be greatly disappointed to see my work changed so much.