Chaosmancer
Legend
Are they? I don't remember any in Greyhawk (there was an orc servant IIRC to Robilar, but Robilar was evil). Dragonlance didn't have orcs, I never used Mystara enough to know. Eberron does a whole bunch of weird stuff which leaves ... wait for it ... Forgotten Realms.
Huh, I didn't know you spelled "Drow" as orc. I mean, you do remember we were talking about Good Drow, right?
And, I also can't seem to find my 5e copies of Greyhawk, Mystara and Dragonlance? Can you tell me what years those new campaign settings for 5th edition dungeons and dragons were published?
Oh, sorry, mid conversation you abadoned saying that Drow are evil by default in 5e and instead switched back to orcs are evil by default in older editions of dungeons and dragons. Silly me. Well, we can discuss older versions of orcs, but I'd still like to hear about how Drow are supposed to be default evil in 5e and how that is totally the default despite half of the published settings having them be good or evil, and the other half not featuring them at all.
In any case it just goes to show that people can change the base assumption. I think if you want to vary from the base assumption for any monster in the book it should be part of world building. The MM is the generic plain version that should be used as a starting point giving the description that fits adversaries for the PCs. The MM does not and cannot represent every aspect of every creature ever used in every campaign setting. For that matter, the races represented in the PHB have pretty minimal mono-cultures as well. Because it's just a default.
Any variation from the base whether that's for monsters (of all types) or playable races IMHO should be left up to the campaign setting. There should also be a big section in the DMG and maybe even in the MM on doing this, stressing that what you get out of the box is just a starting point. I just don't see why orcs should be singled out over every other intelligent creature.
It isn't just orcs. Heck, Drow are in the Players Handbook, despite being less popular than orcs and goblins.
And, again, why does the base assumption have to fit the model of them being mono-cultured evil? Doesn't have to be the case for Dwarves or Elves. Those races are allowed to be a lot more complex, why not orcs and goblins?
I mean, you say that the Elves are mono-cultured, but they have seeds for good and evil elves right there in the PHB. Same with Dwarves. It is obviously there and there is obviously not a problem with it, so, why not give that same treatment to the other popular player options?
And the MM is capable of showing adversaries who could be good or evil. Cloud Giants, Azer, Ghosts,
Dryads, Treants, Djinni and Marid, Myconids. And a lot of these races get less written about them than orcs and goblins and drow. So, if we can have those MM entries able to support being adversaries, good, or evil, then why not for the larger entries on Orcs, Goblins and Drow?