Pouring squares of concrete might be less expensive than running an 18 inch unpressurized pipe through some terrain but building safe, long lasting, ADA complia

Pouring squares of concrete might be less expensive than running an 18 inch unpressurized pipe through some terrain but building safe, long lasting, ADA compliant sidewalks is a far more complex endeavor than dumping some concrete on the ground. Do you stand by your statement that it's cheaper because you have in-depth knowledge of the costs involved or are you engaging in motivated guessing to advocate for a desired outcome?