I havent played rift in a while, but when I did hybrid purifier/sentinel was probably the strongest overall healer build, hybrid dps builds were the best dps, and you COULD max out a tree but it pidgeon-holed you a bit and made you a little less versatile even if you did get an awesome ability out of it.
That said, even if 61 point builds were (randomly picking 3%) better, that's fine, still lets you play around and find your own niche. All they have to do is keep the balance within a couple percent and its good enough for 99% of players. Its when a build gets 5 or 10% better than other builds that theres a problem. I think that was part of the issue with GW2, not that there werent some fun builds, but others were FAR better. I played thief, for example, and there were only basically 2 or 3 viable build choices.. and if you commit to a build you have to go ALL the way for that build or you'd just be gimped. I know other classes had a *bit* more build versatility but I imagine most cases were similar. How often (in pvp) did you see a warrior NOT using thousand blades? (the answer is never)