We don't even know what the 15 conjurer abilities will be. We don't know what the combos available to conjurer will be. We do know that CON will be the main healer, and it seems that people are making the assumption that the developers will give only 1 single-target healing spell... I know it's SE, but give them a little credit. Other MMOs seem to give their healers different types (not tiers) of cure spells, I imagine we will be getting something similar.

As for liking to play strategically, I would think that you should be pleased that the devs are getting rid of tiered spells. Having healing spells with a variety of strengths offers little opportunity for strategic gameplay when compared to having healing spells with a variety of effects. I know that I am engaging in speculation when I imagine a skillset with spells of varying effect, but other MMOs do it, and Yoshi-P is an MMO player, so I imagine that he would draw on his experiences to guide the developers in that direction. Seriously, tiered cures are boring anyway. I'd rather have 1 normal heal spell, 1 weaker heal spell that is instant cast, 1 multi-target heal spell, and a spell that temporarily increases the target's max HP... wouldn't you (once again, I'm speculating, but so are the people that imagine a skillset with only 1 single-target cure spell, and I think that my speculation is much more realistic)? Plus, as at least one other person has mentioned, imagine the combos that may be possible. All of this applies to magic DDs as well. It is possible to have a skillset that offers a variety of damage+effect spells and pure damage spells.

Tiers do not offer depth, which battle in this game is currently lacking (particularly for healers). People fear changing their playstyles, and they fear the influence of other MMOs, but there's really no need. There are good things out there, that when sampled, customized, and adapted to this game will pull it out of the pit it is currently attempting to leave. Could we stop being so close-minded about changes? We voted for drastic change, so drastic change we will get. Drastic change is what this game needs. Drastic change is already working (though, it has just begun). Please have a little faith and stop assuming that the developers never considered something as basic as MP and Enmity management when they planned these changes.