Native Americans started using guns the moment the Europeans brought them over and the Native Americans could get their hands on some.

It's probably similar here. You're like "Hey this bow and arrow is great. What's that? A 'gun' you say? Let me try that..." and there's really no turning back from there.

Historically, training with a gun was easier than training than a bow, so firearms tended to be replaced by guns even though bows were often superior to the earliest guns

if anyone wants to complain about lore (and i am not saying that i am), they shouldnt complain about the blood elves (which were in the old games as high elves) or the whole draenei space journey which adds to the story of the orcs, they should complain about the society of bulls that appeared out of thin air with no relation to any old story and adds nothing to the current story.

You're complaining about the Tauren? The race that played a major part of the Horde campaign in WC3 and who was introduced because the orcs fled to Kalimdor?

Fail.

Erodor: If you complain about tauren, you have to complain about night elves and all the other Kalimdor races (harpies, satyr, quillboar, etc.). The reason they "came out of nowhere" was that Kalimdor was the "new world" of Warcraft III and, much like the inhabitants of the Americas, its races were relatively unknown.

If you must complain about any race, complain about the gnomes. They exist almost soley because the Alliance needed a fourth playable race, and have absolutely no lore pre-dating WoW (and no, a couple vehicles in WC2 don't count as lore).