Bitcoins are easier to pay than a debit or credit card, which can be accepted without a merchant account. In your wallet application on your computer or smartphone, enter the recipient's bitcoin address and payment amount, and you can complete the payment by pressing the send button. To make it easier to enter the payee's address, many wallets can be accessed via qr code scanning or NFC technology.
Do you think it is convenient to use bitcoin?
Yes it is easier to use but bitcoin transactions are not instant so the buyer have to wait until the transaction get confirmed to buy things which is negativity of bitcoin for being used as a currency.But paying with doesn't need any information and bank details just the address is enough to pay them.
There is some process to make it faster just like when you use coins.ph app. If 2 user are using same coins.ph and transfer BTC to each other. There will be no transaction applied and the transfer is instant. I think is using some kind of self miner to process all the transaction happened on their own wallet address.