Mob and Blocks variations

some mobs should vary so they don't look the same for example: Zombies should have different clothes or clothes colors or some cows should be white or black or a rare pink variation like the pink sheep! Or even biome variations like the villagers have a snow variation, pillagers should too don't you think?

Block variations are even better like doors or trapdoors, why don't ladder have wood variations, why do you craft a jungle wood ladder and then you just get the oak one and it looks so out of place or chests why did I make a dark oak chest and still looks like oak, WHY? Or the same with book shelf, thy could all look different like doors or trapdoors do you know? and that is just an example because there is so many other blocks and items that suffer from the same thing like,crafting tables,wooden tools,beds,sticks,shields,fishing rods,bows,lecterns and it goes on. Or even stone items and blocks like why not blackstone tools,furnace,stonecutter and it goes on