Associations with real world ethnicities is an attempt to simplify tamriel cultures to better relate to them. That's fine and all, but don't expect them to conform more than superficially, and do expect them to have similarities to more than one culture. Sure the yurts and nomadic paraphernalia of ashlanders seemed to be riffing off mongols, but lots of it is also bedouin. Their names were more assyrian. House Redoran was almost arabic in some ways. Indoril had architecture that seemed inspired by thai or cambodian styles, as did Almalexia's outfit. Armor types like the chitin, netch and morag tong stuff seemed almost more like the sandpeople from Star Wars tho. Telvanni seems almost like a dark take on paintings of fairy villages made of mushrooms and such. Dunmer living in the grasslands could almost be compared to a bible-era rural hebrew lifestyle.
Basically BGS put a lot of effort into blending elements associated with a variety of cultures so that whenever you think you have the dunmer pegged they could still surprise you. Thats part of why so many people loved Morrowind so much. Nord culture in Skyrim will likely be more constrained, but Todd has strongly implied that their goal is to work in as much of that uniqueness as they can so that Nords don't just seem like Norse culture 2.0.
Which is a bit ironic, considering the whole slavery thing. Lol wait, by 'hang out and chillax', do you mean 'get locked in a cage'?
Ashlanders didn't keep argonian slaves, nor did Redorans. That was primarily the Hlallu (and some other house from the southern mainland whose name I can't remember but started with a 'd' I think, in lore but not in the game).
The Telvanni also kept slaves, but theirs were of all races, including other dunmer.