Safety thresholds determine whether your appliance reaches the repair or replacement boundary

https://crankmaster2.gumroad.com/p/quality-verification-gates-determine-whether-your-appliance-repair-holds-long-term

The 50/50 rule measures appliance safety and function against documented thresholds: if repair cost reaches 50 percent of replacement cost and the unit is halfway through its rated lifespan, measured readings show operating limits have degraded