Just because you are a handler on offence, doesn't mean you will always serve your team best by defending handlers.
Just because you are a receiver on offence, doesn't mean you will always serve your team best by defending receivers.
Those were the main messages I got from this article on basketball matchups.
In fact, the traditional convention of 3 handlers, 2 mids/cutters and 2 longs/receivers might have served a purpose for assigning pull reception roles for a few plays in the past, but it doesn't describe what most players are doing in most systems these days.
I know that the 2008 Dingoes had a variety of roles.
Player A: on offence, a handler who didn't huck and was a semi-regular deep threat; on defence he defended handlers
Player B: on offence, a handler and in-cutter; on defence he defended handlers and under cutters, but got blocks when he could afford to poach off his man
Player C: on offence, an in-cutter; on defence he defended handlers
Player D: on offence, a long; on defence he defended handlers or cutters
So a different system might be needed to describe roles, particularly for defence. Being called a "handler" doesn't tell you what your role is on defence.