Because orkz are 40k badassery and orcs are... well.... Now, with the level LSM community presents, I believe we should relief Belial and let him focus on his deathwinging and put Boreale instead for command, he would fit perfectly.
The difference is at one point there were only Eldar. Dark Eldar and Exodite Eldar didn't exist, so there was no reason to further subdefine them. As a consequence of that, if someone says 'Eldar' without further definition, it can be assumed they mean Craftworld Eldar. On the flipside, however, Loyalist Space Marines and Chaos Space Marines have existed since the very beginning of WH40k. I doubt anyone would be confused if loyalists were just called 'Space Marines', but then you don't have a term to describe all Space Marines, Loyalist and Chaos alike.
I must be honest, I had never seen LSM anywhere until visiting this forum. SM Chaos Eldar Orks There's my distinctions but admittedly when I started playing we didn't have the neapolitan flavours of Eldar and Chaos we have now.
And that is the reason right here. Using unambigious terms for every factions prevents confusion, so you don't have CSM fans going: "But on stream they said that Grav weapons are for Space Marines, we're also Space Marines, give us Grav weapons!"
Well, for being honest, when most people say space marines they mean loyal space marines, i haven't very often see someone who's using the term "space marine" when talking about a chaos dude. You just say chaos. It's not like if there was daemons or whatever else in the game who could possibly confuse you about the meaning of the name. Personally i never use the LSM word. But well, not going to lose my shit at anyone who does so lol of course.
People also drew a lot of conversation pieces from Relic's SM. Talking about that game, and then EC in the same paragraph definitely needed a distinction to remain clear as to which people were referring to.
