I'm confused, I thought the debate with BryonD (in the middle of which I interjected) was about the confessed satisfaction of some people to avoid having 4E-label roles mechanized in 5E.
The thing is, they're really not, they're just somewhat watered-down and the terminology curtain has been restored. Barbarians are striker-light, the Sentinel is defender-light, the Warlock is striker-light, etc. In other words, they don't do their thing as well as they did, not that they don't do them.
The OP was asking what the roles were now, and he got jumped on by a bunch of yahoos saying "there are no roles, your game sucks!".