E-Invoicing purpose and whether it can be simplified?

E-invoicing will be mandatory for taxpayers who had a turnover of more than Rs. 50 crores in any financial year since the introduction of GST.

What benefits does the government see in implementing E-invoicing and whether the entire process can be simplified?

As of now look at the outward supply flow:

1. Prepare Invoice
2. Generate E-Invoice reference number
3. Generate E-way bill

For one outward supply, taxpayer has to deal with 3 documents. By introducing multiple documents, what government is trying to achieve?