Because you would die on slight even if you wanted to chat with the Nightborne and Blood Elves in Silvermoon or hug some Vulpera Fox People in Orgrimmar. You as a Alliance will die by the Axe, Sword, Corrupted Disease from Warlocks, and etc.
Same logic would happened to Horde Rpers too. So I guess Dalaran and Shattrath is open up for places to populate and have ourselves a chat.
Cool Ted Talk I guess.
Umm your an MHP shouldn’t you be crusading or something?
Or better yet teaching Gnomes to crusade?
Obviously it is because you are not on the correct faction to enter those cities and not be killed.
Really we should just gather all you paladins up and drop you into the deepest part of the ocean.
Then all cities can be free of your ideological zealotry.
Weird enough, I wasn’t attacked or chased when I stayed in the fountain. Though i’m not certain if they’ve updated it since WoD. 
Agreed OP.
Silvermoon should be Alliance and the Horde can get umm…Gnomeregan as consolation.
In just because.
Honestly mechagnomes should had gotten the opportunity to be paladins
Worship the “light” as in their lightbulb they invented
You can’t go to Silvermoon or Ogrimmar as an Alliance character because the games gm says Blood Elves and Orcs hate the alliance and will kill them on sight. As with all rpgs, players are still bound to the rules set forth by the games GM.
To be fair I’m pretty sure that haircut is considered a crime in Silvermoon regardless of your loyalty.
It would be so weird seeing a Tauren walkin’ around Stormwind willy nilly, same with a Human in Org lol.
They can have a little lightbulb in their stomach. So every time they need to channel the light they flip a switch.
To me, that would be the same as asking why a Hell’s Angels MC member
cant just walk into a Outlaws MC club house. We all know why.