you can create at least 1 warehouse per business unit for cost controlling
you may want to have multiple WHs within the same BU in order to support different SLAs (i.e. 1 WH for interactive analyst/developers and 1 to support a production Dashboard)
you don't need to separate WHs for data governance purposes, since data access is managed by Unity Catalog
use WH tags to facilitate observability
use API/Terraform to automate WH provisioning
use API (i.e. for query, alerts) to monitor query executions and for QA purposes.
use serverless warehouses for lower admin overhead and faster scaling of interactive/bi workloads
