Decided I really, really want the option to choose shaders

I totally agree, the art of the boss threw me off too. Along with the art of the Buer, it looks...2D in a 3D landscape...wtf lol

omfg I know but the other enemies are 3D LOL

Don't be rude ahaha

Hmmm. Interesting. It doesn't look very 3D in the game play. Maybe I just can't see it; usually keep my screen at a low brightness. I'll hafta have another gander at it. :p

Turning a switch is a bit of a semantics argument... But yes, adding multiple shaders to the game adds WAY TOO MUCH WORK for everyone.

Texture artists have to paint multiple versions for each character. Shader artists have to tweak the shader to match the texture for each character. Art leads have to QC each shader style to make sure they look good, and that they're consistent. Revision time spent for every tweak that has to be done for each character (artists waiting for feedback, time to read and interpret feedback, time to load character models, paint new textures, save texture files, send message to art lead to check revisions, etc.) They also have to make sure that the textures are actually assigned to the correct shader set. Not to mention the number of texture atlases you have to stick into the game's installer, which adds up very quickly.

So to have just two shader variants, you already doubled the workload for each person concerned. And how many characters are there in the game? How many enemies? How many projectiles? Weapon VFX? Creature VFX?

Long story short, needs too much time, needs too much work, needs too many in-game resources.

In response to the idea that alternate shaders can't be included because they'd either look bad with the existing assets, or would require too much time/effort/money: If someone's using an alternate shader because they think the default one looks bad, I think they're going to be more willing to put up with the alternate not looking perfect, as long as it addresses their problems with the default. There's a considerable community of PC gamers devoted to texture and shader replacement. Consider tools like ReShade and SweetFX. I've never felt the need to use something like that before, but I'll certainly be thinking about it for Bloodstained, and hope that the shader community takes an interest in it.