Yeah because people totally dont go there on off-peak hours and park their characters there.
Also lol @ the game being dead on every DC minus aether, every game has dedicated servers, WoW also had specific servers for specific content and hell even specific factions, many other MMO's have such things, people always dogpile on specific servers for X or X thing, this isnt an FFXIV thing nor is it abnormal, but thankfully SE managed to convince you that people wanting to play with others is not a normal thing to want.
Primal has PVP, Crystal has RP, Aether has content, the only servers that dont really have a "focus" are on Dynamis because it's very much dead.
EU also has the same, Light is for content and Chaos is more laidback and is basically just people hanging out.
Edit for typos