Dont worry about the loader arms. I am not saying that it "cant" happen. But it is unlikely. People do it everyday, and have been for years without issues. Properly set-up, with the springs and a crossover relief, you have nothing to worry about. You are just pushing snow. Its NOT a dozer blade, and dont require arms and a frame built like one either.
And like wallace said, when pushing into a pile of dirt or gravel, its the same thing. In fact (and I am sure I am not the only one) there have been SEVERAL times when I DIDNT want a full bucket. Like say filling just a rut or pothole, and dont want to dump 5' wide path of material, I will go into the pile at an angle JUST to fill one corner of the bucket.
And what about when you are digging with it and catch a tree root or something on only one side?? That puts way more side force than an angled snowplow.