That was because heals are great for adding APs to your total, and every Templar has the potential to heal with any build.
I still say a bow/ranged magicka build would be just fine. The biggest nerfs have been on the healing side, and seem worse only because they're taking out the effective parts of the class without adjusting the ineffective parts upwards. If they give several rounds of buffs to compensate there might not be an issue in the long term.
I can also see some possibility for a magicka tank build that would have decent success.
There were a lot of people wanting to be a healing Templar, which now seems less viable because you have at least two other classes that are better healers when set up to do that job. There were also people wanting to be a stamina build as a Templar, which also isn't a particularly good idea because they lack the class skills to benefit that build, and other classes do it better.
At this point the only thing that makes any sense at all is they wanted to eliminate overlap between Restoration Staff and Restoring Light, by cementing Restoration Staff as the ranged HoT line, and Restoring Light as the short range burst line. The only way to do that is to reduce the effectiveness of the "trick" of the one-trick pony and also increase heal values so that Templars can burst heal better, and fix the magicka regen problem at the same time. They've done the nerfing, so now they need to buff.
The problem right now is they're not communicating, and it looks a lot like they're just smacking Templars down while leaving classes that are seen as more powerful at all roles alone. My knee jerk reaction is that Matt Firor is exactly the dev to do that, but hopefully the others have more influence over class balance.
Mircutio did exactly this; the first round of nerfs destroyed the setup as it's so magicka reliant. It went from arguably too powerful to being unable to kill on-level creatures.