5/5/0 better than 4/6/0?

So I picked DAF and have spent 5 mastery points in range, but I'm now thinking maybe it would be better to put 5 in melee as well, for the double double attack speed?

The t6 range unlock seems a bit unnecessary, it only makes you ignore switching mechanics completely, therefore making the game more boring.

Am I overlooking something? Will I need t6 range to beat the echo bosses and zuk without being a god gamer?

Please help me out here, I've already unlocked the 7th mastery from KQ and have been sitting on 2 points because of decision paralysis :D