the Jester
Legend
Every edition's monster manual as far as I can tell has entries for dwarves, halflings, elves, etc., that have a similar listing as monsters. These usually include tactics for attacking the party, etc.
Does anyone ever use these?
Hell yeah!
Do you ever use a warparty of neutral elves attacking the party as unprovoked as a clan of gnolls or a pack of wolves?
I think you're looking at wolves and gnolls in too simplistic a manner. The real question should be, "Do you ever use a warparty of neutral elves attacking the party?"
Hell yeah!
I think that my group would have major issues if I started using PC races as monsters. A specific named NPC as a villain, sure. Maybe even members of an evil cult. But just "these are generic dwarves attacking your group" - I don't see that flying.
Why not? Seriously, this seems like a really strange hangup. Have they never encountered bandits? Brigands? Gold-crazy dwarves defending their claim? Xenophobic elves or gnomes? Cannibal halflings?
If my view is typical, then why do game designers keep adding PC races as monsters?
My guess is that your view is extremely atypical.
Beyond "this is what a typical warrior of this race looks like for comparison purposes" what good does it do to stat up a bunch of things that most players will never fight?
Ditto for good-aligned dragons, angels, etc.
First of all, not all campaigns are simplistic good-vs-evil affairs. Anything with moral complexity, shades of gray or an acknowledgement that just because two guys are the same alignment doesn't mean they can't be enemies will offer plenty of opportunities to fight good monsters.
That's without even bringing up evil parties, which are a tradition dating back to the earliest days of D&D, despite the occasional attempts to recast D&D as strictly heroic.