finally caved and removed my redundant color scheme definition in the flake.nix file to use stylix's built-in color scheme definition

hosts/desktop/home.nix

@@ -4,9 +4,7 @@
   self,
   inputs,
   username,
-  wallpaper,
   lib,
-  scheme ? {},
   config,
   ...
 }: let
@@ -17,7 +15,7 @@ in {
     useUserPackages = true;
     useGlobalPkgs = true;
     backupFileExtension = "backup";
-    extraSpecialArgs = {inherit self inputs host wallpaper scheme username nur;};
+    extraSpecialArgs = {inherit self inputs host username nur;};
     users = {
       ${username} = {
         programs.home-manager.enable = true;

hosts/laptop/home.nix

@@ -4,9 +4,7 @@
   self,
   inputs,
   username,
-  wallpaper,
   lib,
-  scheme ? {},
   config,
   ...
 }: let
@@ -17,7 +15,7 @@ in {
     useUserPackages = true;
     useGlobalPkgs = true;
     backupFileExtension = "backup";
-    extraSpecialArgs = {inherit self inputs host wallpaper scheme username nur;};
+    extraSpecialArgs = {inherit self inputs host username nur;};
     users = {
       ${username} = {
         programs.home-manager.enable = true;

hosts/server/home.nix

@@ -4,7 +4,6 @@
   self,
   inputs,
   lib,
-  scheme,
   username,
   config,
   ...
@@ -17,7 +16,7 @@ in {
     useUserPackages = true;
     useGlobalPkgs = true;
     backupFileExtension = "backup";
-    extraSpecialArgs = { inherit self inputs scheme host username nur; };
+    extraSpecialArgs = { inherit self inputs host username nur; };
     users = {
       ${username} = {
         programs.home-manager.enable = true;