"No discounts, big shot."
Arcite 99-40 is the last of Lord Shaxx's personal combat frames. When he chose to remain in the City to oversee the Crucible, Shaxx had Arcite's combat systems deactivated and rebooted with the Tower's more civil vendor protocols.
Arcite's memory banks still remember the battles he has seen. This knowledge makes Arcite uniquely qualified to equip Guardians for combat. His outward disdain for untested Guardians is a combination of learned behavior - a byproduct of years in service to Lord Shaxx - and personal experience. His systems may have been reprogrammed, but the love for combat still pulses within his circuitry.