You can also get discounts on e-commerce sales using HDFC RuPay Regalia credit card.
Visa and MasterCard is not sponsor on any e-commerce sales. E-commerce sales discount money paid by banks and few percentage paid by merchants.
Visa and Mastercard are just card networks, similar to RuPay and have nothing to do with discounts on e-commerce sales.
Only thing i agree with you is that outside India Visa and MasterCard accept everywhere. Discover and Diners Club card network has limtied acceptance.
Currently, I dnt recommend anyone to use RuPay card as your primary card for international transactions. Ya, you can use RuPay International cards as backup card. Agar chala toh chala, nahi chala toh nahi chala.