As a freelancer I have said on several occasions "this won't work". After the 3rd time I would just get on and build it. Every time it was "people will do this

As a freelancer I have said on several occasions "this won't work". After the 3rd time I would just get on and build it. Every time it was "people will do this and this will happen". But people do stuff wrong in seemingly endless ways. Getting paid for building useless stuff was not a joy.