Yeah, imagine my RPG without a client mod.
/inventory
...
Inventory: Ironite Pirato Longsword [equipped, 91% durability, 99% quality, 14 weight], Ironite Pirato Shield [equipped, 74% durability, 78% quality, 24 weight], Ironite Chunk [33% quality, 3 weight], Ironite Chunk [98% quality, 8 weight], Ironite Chunk [88% quality, 1 weight], Pirato Log [97% quality, 7 weight], Dirin Armor Plate [equipped, 97% durability, 67% quality, 34 weight], Dirin Pirato Two-Handed Sword [equipped, 100% durability, 88% quality, 24 weight], Dirin Chunk [98% quality, 2 weight]... and so on, with a message saying [PgUp to see more].
Plus forgot to include item sizes, which would show that Dirin is lighter than Ironite, instead of just having the person think the Dirin chunk is just really small.
Now imagine trying to drop the ironite chunk with 88% quality and 1 weight without a GUI. Would you simply spell all of it out, or would you give an ID number? The time you could've spend just hitting [Download] and then dragging a zip file into your add-ons folder would be much more worth it than typing out /inventory, looking around for that heavy item you don't want, and typing /drop [whatever you need to type to drop it]. And inventory is just the start of it. There's also stats, skills, very detailed team and location statistics, storages, using skills in combat, core HP during invasions, character selection GUI, the HUD itself and no i'm not using a bottom print and a center print, that's not enough, try including: HP, stamina, energy for each piece of equipment that uses it, Core HP, skill cooldowns, enemy HP (under certain situations, like having a specific high skill), team stats showing HP and stamina, shield bar for energy armor. Also 2d music per client, and the list goes on.
Please try to replicate all of this without a client mod and actually have people enjoy it.