the validity of a lawsuit CAN be prevented by not allowing the point of legal jeopardy to take place, i.e., if we do not allow DIY advice to be given, then we cannot be held liable for giving DIY advice that leads to injury or death.
So, no DIY for dangerous things. Advice like "check your air filter," or "is your thermostat set to cool" is permitted.
Not discussion of current draw for motors which is clearly directed by the desire to replace a motor oneself. THAT is DIY.