This data pack does three things. The first is to change how deepslate works. The second is to allow players to rework stairs and slabs of stone materials (e.g. putting 4 diorite stairs in a crafting grid to craft polished_diorite_stairs). The third is letting #stone_tool_materials be substituted for cobblestone in recipes and expanding what those materials are. These two changes are different enough to justify creating two seperate data packs but because they tamper with the same things and I want to use them together I needed the two to have a shared understanding of how deepslate works in the game. Crafting recipes should unlock automatically.

Deepslate
I've always found it strange that the new deepslate works so differently from stone. You can craft the cobbled variant straight into bricks without smelting it first and if you used silk_touch or spent time cooking the stuff you don't get anything out of it. Although this is akin to the new blackstone blocks which don't have a smelted variant deepslate, deepslate was obviously made to be like stone and I don't see why it should be made an exception. My compromise is to require cobbled_deepslate to be smelted into deepslate for the crafting of deepslate_brick and deepslate_tile, but leave the recipe for polished_deepslate the same. After all, you don't need to cook andesite, diorite, or granite to polish those stones. Because I needed to remove some recipes in the game (the ones that turn cobbled_deepslate into deepslate_bricks) I had to create a recipe to cover it up. So if you put a petrified_oak_slab into a stonecutter you can turn it into an ordinary oak_slab. Your welcome, I had no idea that block existed before.

Reworking stairs and slabs
The number of recipes behind this simple addition is outstanding. I will not name every recipe, but I will give examples of 4 ways this affects crafting.
1. Crafting polished, cut, or bricked; slabs and stairs
e.g. putting 4 diorite stairs in a crafting grid to craft polished_diorite_stairs.

2. smelting cobbled or !smooth, slabs and stairs
e.g. smelting cobblestone in a furnace to create stone.

3. stonecutting slabs and stairs into polished, bricked, or cut variants
e.g. putting a stone_slab into a stonecutter to create a stone_brick_slab

4. stonecutting stairs into their respective slab
e.g. putting a stone_stair into a stonecutter to create a stone_slab


#Stone Tool Materials
The first change is obvious. Make it so the blocks you can craft a stone_pickaxe can be used to make furnaces, hoppers, droppers, and so on. The second change adds to the current list expanding what things qualify as cobblestone. I will explain my reasoning behind these choices because it might not be the popular opinion.

In addition to, cobblestone, blackstone, and cobbled_deepslate, I added mossy_cobblestone, end_stone, sandstone, and red_sandstone

mossy_cobblestone because its made of cobblestone. I don't really understand why this can't be used already.
end_stone. I'm less confident on this one but I think since you can make bricks out of it that it should qualify. Mainly I think its important that a source of stone exists in every dimenstion.
sandstone. When I said my choices were controversial this is mainly what I was referring too. I chose sandstone for two reasons. First, since it can be smelted into smooth sandstone it has a stone equivalent like cobblestone does. Second it makes the desert more survivable. I realize this makes it so one can skip over the wooden_pickaxe step of the game, however, personally, that is what I find so thrilling. I figure that digging up 12 blocks of sand isn't much easier and I like it when a game has multiple ways to progress.
red_sandstone. Same reasons as above

You might be wondering why andesite, diorite, and granite didn't make my list. It certainly appears quite often in the lists of others. I suppose those rocks make just as much sense if not more sense than sandstone. The main reason is personal bias. I don't like those blocks and I don't really see the point in making them useful. Normal stone is prevalent enough in the overworld except in two places. Oceans and Deserts and those have sand.

If you disagree with my choices this is the easiest alteration to customize. Simply change the contents of the cobbled_stones tag in stone_fixture/data/minecraft/tags/items/cobbled_stones.json.

Other_Changes
increased xp obtained by smelting bricks to crack them
added stonecutter recipe to turn stone into cobblestone and deepslate into cobbled_deepslate