So I'm coming to the conclusion that the OP's post is a:
1) Thinly veiled snipe at raiders and people farming content.
2) Said snipe is then used as an automatic counter to pretty much any disagreeing response.
3) Try to think about using spear more.
4) Dropping it on a healer is likely good, dropping it on a DPS is likely bad
Regarding points one and two, I think you're missing one of the biggest factors that drives high end raiders along. Raid gear? Meh, we know we will get everything we want from a raid tier within a month or two now, most of it is ugly as sin and is just going to get glamoured over anyway. Rather the majority of us are there for the path of self improvement vs the limits of our own ability, the competition vs the limits of our peers, the banter with rivals as well as all the other social facets of the raiding scene and FCs in general.
Given that I spent most of my A10 farming sessions dodging troll button pushes and raising those that got caught napping, I find it kind of hard to agree with your assessment
Onto point 3 and the spear topic itself, it's a pretty legitimate point, the card does have it's uses (as do all the others that are invariably seen as RR/Crown fodder frankly). I also completely agree with point 4, dropping it on a DPS is a distraction that they likely neither want nor need, in a chaotic dungeon or 24 man run it's likely not going to be a big deal. In a Savage turn it's going to cause issues tho.
However, there's another aspect to this that the math always overlooks, quite simply, the time it takes for you to work out what to do with the card as well as the speed with which I can deal with a card appropriately and get Draw back on CD. If I waste a GCD or two flapping about what's best to do with a card that's not balance, I've likely lost any value that it would have offered and perhaps more. Any time spent with a card held waiting to be used is eating into my opportunities to pull a balance. I want to pull and use/dispose of cards as quickly as I can with as little thought as I can get away with.
In the end, it's usually more efficient to just auto arcana anything that's not conductive towards an AoE balance and instead concentrate on maximising your personal DPS.