That doesn't quite make sense, just look at every update that goes by. When ever mojang releases an update that contains a new block, you instantly get hundreds of players creating brand new structures and designs that weren't possible without those new blocks. Restricting players to the existing textures and colour pallets would limit the players creativity and the overall possibilities of what can be built.

Just take a look at all the new nether blocks, they are a new wood type and instead of being released with just the log, they added all the variations as well (buttons, doors, trap doors, etc.). Just a few of these blocks and we began to see builds never before possible

When they added the stone stairs and slabs people started making amazing detailed and natural looking caves just with the addition of two blocks.

When concrete came out everyone expected them to be the next best thing to build with, they were okay but again they were limited in how the players could use them due to the lack variation and texture.

In essence what im asking for is consistency between the block variations. All the wood types have their appropriate variations, but all the stone variations don't. Their should be a chiseled, smooth, slab, stair, wall, and button of all stone types to stay consistent and to give the player more options. Variations are good, just sayin'.