This article have missed to cover about low fee newbies used to put to save cost on payments leading unconfirmed transaction for many hours. That will make them panic about bitcoin and they will start blaming bitcoin network for it and some may even opt out from the idea of using bitcoin again. 
The article is quite rubbish actually because they say it's not worth to keep bitcoins in wallet like coinbase while even the official bitcoins site links coinbase for keeping bitcoins. Another point I don't agree is : How can I revoke a wrong payment
Because even if you send a payment to wrong paypal id you cannot reverse it unless you make false claims and take it back.