> Anyone can choose the tech stack, patterns, or whatever that he likes

Maybe for personal projects, but 99% of us have to use the tech stack, pattern or whatever of our employer that was decided on (presumedly by some consensus at some point in the past). Publicly pointing out the flaws in what might have made sense then but might not make sense now is a Good Thing so that those flaws might be taken into consideration in the next round of consensus building.