You may not need a full ERP
ERP becomes useful when repeatable orders, purchasing, inventory, delivery, billing, or reporting cross several people and systems, and manual reconciliation now creates costly delay or error.
Stay with specialist tools when volumes are low, the owner can still see the whole process, integrations are dependable, and the proposed ERP would add more fields and administration than control.
Use a hybrid when standard accounting, payroll, tax, commerce, or inventory should stay in maintained products while a custom AI layer coordinates your unusual service, production, approval, or knowledge workflow.