What 20 lines of code, and what has the amount to do with whether the criticism is constructive or not, and valid or invalid? "Doing things this other way woul

What 20 lines of code, and what has the amount to do with whether the criticism is constructive or not, and valid or invalid? "Doing things this other way would serve us better, for this reason" is constructive criticism by definition. Non-constructive would be "doing things the way you do them is stupid". Responding with ¯\_(ツ)_/¯, with "don't write any bugs lol", or with "just do extra work" is ignoring feedback.