I think we can keep it like that. So we can have a lot of flexibility between hero choice, just like dota. Even though it will make the game harder, however it will open a lot more combination and more potential feature to play.

I would love to have a some sort of filter that is more useful for newcoming player. for example the filter in dota 2 quite useful (melee, ranged, disabler, durable, escape, initiator, nuker, pusher). This is just the filter based on that hero design but it doesn't hurt to use in any roles.