The Block Bindings API connects block attributes to dynamic data sources — post meta, options, or any registered source. core/paragraph can read its content from _my_meta_key without a custom block.
This collapses many cases that previously required a custom block. A pattern with bound metadata becomes a reusable template that always shows the current value.
Sources are registered via register_block_bindings_source() with a callback. Patterns can then declare bindings inline in their HTML.