Input regarding not using Applying receipt against transaction functionality in receivables

We need your input regarding not using Applying receipt against transaction functionality in receivables:

User requirement: Considering the business model of the client in which sale proceeds are received by client through sale of their products not according to the invoices raised by them to their customers but the proceeds are received on recurring basis where at a certain date the client might have advance from customers in books or receivable from customers. On the basis of above client requirement, they don't want to use the feature of Applying the receipts against the transactions as the receipts are not as per sales invoicing. Please suggest us your recommendation on the same and any impact of