occam
Hero
Now you are assuming the longspear proficiency is "pointless" just because you can't use the longspear at the same time as a totem. Why is that?
I believe it is a quite straightforward choice: either choose to wield one (or two) totems, or wield a longspear.
How do you make an MBA with a totem? Shamans don't have an at-will basic attack, like other implement wielders; they have to use weapons. A shaman choosing to wield a longspear (a proficiency explicitly called out for them, and clearly their best choice for most situations) is hampered when performing the main functions of his or her class. Meaning that unless you can wield a spear as an implement, the longspear proficiency is pointless.
Compare them to wizards: they also have a two-handed weapon proficiency called out (for quarterstaff), but they can use that weapon as an implement if they choose, and they have a magic missile basic attack if they don't. I believe the totem/longspear conflict was an oversight by WotC; I can't prove that, but that's how I treat it.
And I would reply that is possibly quite overpowered at low heroic levels, but each to his own. There certainly aren't any hard rules to contradict your ruling.
Maybe. I haven't actually gotten to play a shaman much yet, but so far a spirit companion moving in three dimensions doesn't seem to have much effect, nothing more than a ranged power would. After all, you can't ride the companion, nor can you see through its eyes.