The fundamental problem was that the Monster Slayer was not exactly a beginner-friendly mech when utilized in actual combat.
Ketis was a highly skilled swordmaster, and spent most of her time interacting with Swordmaidens and Heavensworders, both of whom possessed remarkable skill in swordsmanship.
That made it a little more difficult for her to understand the plight and circumstances of mech pilots that comprised her actual clientele for this mech model.
Did she overestimate the competence and discipline of her customers?
Had she neglected to implement enough safeguards to prevent the mech pilots of her Monster Slayers from throwing themselves into near-certain death?
Or was it mainly the 'fault' of the Ocanon VI Branch of the Larkinson Clan for dominating the rankings by repeatedly defeating terrible monsters in solo hunts?