Top of the blast furnace texture could be used for a smooth deepslate block

I realized that the texture from the top of blast furnaces look like smooth stone but dark like deepslate.
Since deepslate is wanted to be an alternative to usual stone with crafting recipes, this would allow players to use deepslate for more crafting recipes ( blast furnaces, armor stands,... ), and stone from grindstone, redstone repetor and comparator recipes could be replaced by smooth stone and smooth deepslate.

Also, since cobbled variant from deepslate is used to make building blocks ( polished, bricks,...), it would give an interest to get natural deepslate.