Intriguing point. However, I don't know that it is entirely accurate and a bit of an oversimplification. My mage is dps. I have him outfitted with a number of energy regen items in addition to having dedicated a number of points to energy boost. Admittedly, this has been at a sacrifice to skills (before update 4) such as fire cloak and various lures. It allows me to solo, contribute to boss fights quite effectively, and still provide support to druids who need a boost as well (yep, I've spent a number of fights as the boost b***h). While I have friends who aren't happy that I don't have a lot of points in certain lures, I still can both support and dps. While I was considering a change before the update and wanted to see the new skills, choices like that are part of the process with ch.
I think what i was more saying was that if a mage stays pure support, with boost and sacrifice, cloak and lures, he shouldn't run out of energy.
If a druid stayed heals, with the odd boost and meditate, again shouldn't run out of energy.
My druid is only heals and never runs out of energy, even in a 30 minute fight and constantly healing, barking and warding, when I change to 50-50 i always run out of energy.
My earlier post was just pointing out that nearly everyone want to be doing DPS with some support.
Edit: my druid has 0 sigils