I don't understand peoples fascination with skill trees. Skill trees are just high maintenance jobs with less personality and limited individuality.
Look at SCH and SMN: SCH is in an amazing position due to the fact that they can't nerf the Arcanist skills because of SMN.

It baffles me why people would ask for a 'Paladin that can main heal' over 'An entirely new, sword and board job that can main heal'. It's pretty much the same thing - but without the class limitations built in. Try build a sword wielding healer from Gladiator? Not happening unless they drastically overhaul it - at which point you've reach the SCH/SMN issue and may as well invest the time in creating an entirely new job.

Classes are dead. Skill trees are dead. Get over it.