They deliberately don't let you define whatever abstractions are meaningful you, it's called the Principle of Least Power: http://www.w3.org/DesignIssues/Principles.html#PLP

Just explaining that what you consider a "strange" design choice is actually deliberate and carefully thought out, not defending it--for all I know, it might have been carefully reasoned out but the wrong conclusions reached--but the results stand for themselves: a platform that is now synonymous with "the Internet".