The calcite set is practical, not just decorative. Pillars, slabs, stairs and walls plus Stonecutter support means builders do not have to sit there hand-crafting every variant, and the polished/bricks chain gives enough texture variety for clean bases or cave builds. I also like that Mojang is bundling it under the same block family with a clear behaviour label, because that usually makes future additions easier to follow. The keyboard navigation is the bigger long-term change though, even if Creative Inventory is still missing from it.