Composters are going to become a cheaper yet more effective version of the cauldron for redstoners, allowing redstoners to just replace all cauldrons with composters in their circuits. Although this block cannot be moved as of 19w03a, this has been considered as a bug(MC-142465) and is likely to be fixed.
Now that the cauldron is no longer necessary in redstone circuits, it's safe to assume that there will be no backlash for converting cauldrons into immovable block entities and porting over all the cauldron functionalities from Bedrock Edrition.
Dinnerbone has already stated that complex recipes will be moved out of the crafting table and into specialized mechanics, and if the change to cauldrons happen, it will most likely take the mechanic of dying leather armor and making tipped arrows.
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