I think Morphite must be using a vignette shader I presume is provided by default with Unity. There's only one key difference I can specifically point to. While I was successfully able to remove a couple of annoying shaders from another Switch game (Windscape's bloom shader is ten kinds of awful and went bye-bye) it's failing with Morphite (the game simply crashes on start.) Unfortunately that doesn't give me much to diagnose it with. It has a vignette shader that is just awful IMO. But more specifically, right now I'm actually trying to do something a bit more unusual: I want to modify a Switch game, Morphite. I've run into a few games like My Time at Portia which apparently run some sort of check on the files and if they find an asset missing produce an error and crash or stop though. The game can't load it and then just simply doesn't use it in most cases, which works just great.
For most games I can just simply use this and remove the shader asset responsible from the appropriate assets file.
I'd like to be able to mostly just remove effects for games with no settings to disable them (which, unfortunately, means most Unity games.) For example, vignette and motion blur shaders.