Icy Caves, Snowy Caves and Frosty Caves

Why they're not gonna add this? It's a mixture of Caves and Cliffs. Icy Caves could be found in high and wide Icebergs. This goes from Y=75 to Y=50. Snowy Caves can be found in snowy taiga biomes. When you'll go on this cave you should wear leather boots because there is a lot powdered snow here that could go up to 3 blocks that is enough to freeze you, this goes from Y=65 to Y=31. While the last, Frosty Caves is the deepest cold variant cave, because it will go from Y=52 to Y=7. It contains packed ice, blue ice, ice, snow layers, snow, and powdered snow. Also this is the best place to find lapis lazuli. It's the combination of icy caves & snowy caves. So hope they'll add this on the 1.18 Caves and Cliffs Part II