Renewable Sand and Gravel with a Sifter and Crusher

Since we now have ways to renew dirt, lava, and clay, it would be really cool to renew gravel and sand. We could have the crusher turn cobblestone into gravel and the sifter turn gravel into sand. With these too, there could be a minimal chance to get shards of a new material or old material to craft new things for upcoming updates. You could also use sifters or crushers for other blocks to get new blocks for future updates or possibly to get other existing blocks. Of course, this will be a semi-late-game item so that there are more chances to explore deserts or oceans for gravel and sand. Possibly the materials for the sifter and crusher can be in specific biomes for exploration as well.