Best Practice: Bill Purchase Orders for Standard Cost Method Items

We are a relatively new company using NetSuite and in process of developing Purchase Price Variance reporting and review procedures. I have read through all relevant SuiteAnswers and Community posts, still need some clarifications and greatly appreciate any and all help.

USE CASE and QUESTIONS

Standard Costing method is used for all Items

Advanced Receiving is enabled

Only USD currency is used, Exchange Rate is not an issue

Inventory Items are purchased from Vendors for use in Manufacturing Assemblies

Typical Purchase Orders are for large quantities with Item Receipts over a period of time and sometimes also include Expenses

Match Bill To Receipt has not been marked for any Items on any Purchase Orders, but we are trying to evaluate if we should be using this feature as a Best Practice