"Write to Other Table" was deprecated because we introduced "Send table data" as our new way to send data from one table to another. The legacy "Write to Other Table" columns are still available when you use the "Add Enrichment" button, but we'll keep that option in place only until rollout of the new routing features is complete.
If you need any more help understanding the transition from "Write to Other Table" to "Send table data," please let me know. Would you like to share more about what you're trying to achieve with this feature?