I really like the Bedrock Creative Inventory; instead of your Survival Inventory being in a new tab, the inventory looks the same as it does in survival, with the recipe book acting as your creative inventory where you can access all the blocks

There should be a toggle to switch between the current Java UI, and the Classic Bedrock UI

Back in the day BRB had this feature but I think the socpe would be too large to support forge and fabric mods that extend the creative menu. They are two very different systems

probably a duplicate of #8