Why would people say General Haig was a bad leader?

General Haig is often criticized as a bad leader due to his high casualty rates during World War I, particularly in battles like the Somme and Passchendaele. Many argue that he was overly reliant on outdated tactics and failed to adapt to the realities of modern warfare, leading to unnecessary loss of life. His strategies are seen as lacking in innovation and effectiveness, raising questions about his decision-making and leadership qualities. Additionally, his detachment from the front lines and the suffering of soldiers further fueled negative perceptions of his leadership.