Blanket Purchase Agreement (BPA) or CPA with terms library can replace procurement contract?

Summary:

What is the specific use case that client has to go for procurement contract? Terms library (Clauses, Terms templates) is tightly integrated with purchasing documents like PO, BPA, CPA, RFQs. In such case, why contract needs to be created in procurement contract. It can be mapped as BPA or CPA as well.

Content (please ensure you mask any confidential information):

Let's assume the use case that client will negotiate the terms and conditions for new purchases (T & Cs, scope of services including lines) as part of RFQ cycle and it needs to be converted as agreement / contract. Based on agreement / contract subsequent POs will be issued.