Most mech designers never became good enough to challenge the market leadership of SKL Mech Industries.
It was sheer folly for them to even think about competing directly against this monster of a mech company!
Smaller players simply did not have the skills to compete against the large amount of excellent mech designers employed by SKL.
Even if there were individual mech designers who excelled so much that their products could actually achieve parity with the corresponding sickle mechs, their own mech businesses were simply too small and inadequate to match the industrial prowess of a giant mech enterprise.