API Management to expose SAP PI/PO services

Hello Gurus,

I was learning open sap course about api management. There is a section, in which SAP PO service is exposed via API management.

Does that mean that we have to use API management to expose SAP PI/PO services such as SOAP, REST? In our project we are using some kind of reverse proxy to expose the soap and rest services.

Even SAP CPI is getting connected directly with source and target systems. Nobody seems to be using api management.

Should I ask my client to switch to API management?