Ah well.... to spark this argument again...

The cities are not even that big, I dont see the need to walk the chocobo inside any city. No mounts inside cities please.

Reason? inside cities there are always specific gathering points for players: right outside the Wards, the Guildleve counter, the Repair NPC (This might change with incoming changes in 1.19), etc. The lag this would create once were up to 2k ~ 3.5k players will be horrible. And besides the fact it would break "immersion" xD