Naga are just awesome. That's why I want it to be a playable race. I loved them in Warcraft III (when I first started really getting into the franchise). They have always been part of the game since vanilla. They slither around. Just tons of awesomesauce imho.
Yeah, armor and mounts would be a challenge. But not a tough one. Plenty of solutions for those.
-Aquatic form equivalent racial
-Slither for their ground mount, water bubble summon for their flying mount
-*Tail Sweep* AoE 70% snare 10yd range on a 1m CD
-have armor not display on their tails, just like you dont have it display on troll feet, no big deal
Also they are one of the oldest races with a lot of history and lore.They are numerous enough to become a playable race even if it was a splinter faction.They have naga babies that grew up as naga and may not hate the elves or anyone else with the same passion as the naga that actually participated in the war 10k years ago.
The young naga may somehow realize that all that they've been told about the land dwellers is not entirely true and they are not the real enemy.
Actually I believe a fair compromise would be give the alliance Jinyou they wouldn't be that hard to fit armor on and to fit on mounts. All they would need to do is further change them up a bit because I see there being complaints about them having the male night elf model.
...and hozen monkeys fit the horde all naturally...
But about the OP: I agree. Naga fans need to take their heads out of their arses.