Trying to explain a game developer in a community, why its a bad idea to only make client side patches for equiptment to appear correctly..

me: because the server needs to be aware of the changes made to avoid faulty calculations, for instance if the client calculates a fatal but the server disagree..

dev: but it works...
me: yes, but not optimally.
dev: Working as intended (TM)
me: ... teh fuq?

not sure if he's a bad troll or wut..