Sometimes we merely look at what is stated and not the intent of the documents required. I have to agree that there seeems to be a lack of explicitness in the person who made the website and I myself would disagree on its seeming simplicity.
There are actually 3 things to be validated before approval:
1. You are the person you claim to be... how? A government issued ID (Passport, Driver's license, etc) would be the strongest, then a company/school ID and anything official which could validate your identity (not a National bookstore bought ID which anyone can readily fill out)
2. Proof of Income and Capability... how? something to show that you can sustain the monthly bills...ITR, credit card statements for the past 3 months. Bank statement may be weak as it only shows the money you have for that particular month which you could easily withdraw anytime.
3. Proof of Billing... something to show that your claimed address is CONSTANTLY being used to collect from you or bill you and not just an address where mail could be delivered.
Hope this helps.