Though wouldn’t a spear or even a normal sword be better? The pictured blade looks like it would be incredibly awkward to thrust with enough force and accuracy to puncture heavy hide.

I think the shape is so that it doesn't get stuck in the boar (thus staunching the bleeding to some degree). Awkward, definitely though.

(And I’m guessing this thing’s existence is because nobles consider spears to be lower class?)

Probably something like that. A fancy piece for hunting with your noble buddies, wouldn't want to appear like some kind of PEASANT or anything like that.