[4] He played a crucial role in limiting government censorship and safeguarding civil rights through his legal decisions.

[3] Landau's rulings sometimes obscured his personal political stance, yet he consistently opposed judicial activism, emphasizing the importance of judges avoiding political agendas to maintain public trust in the judicial system; those positions of his own are used until today as arguments in support of reform in the judiciary of Israel.

[3] Historians have praised his independence and openness to new ideas, highlighting his uncommon willingness to evolve and adapt his perspectives.

[8][7] In 1957, Landau contributed significantly to the court-martial of the Criminal Court of Appeals, addressing the issue of lawful orders in a case involving the killing of 48 Arabs in Kafr Qasim.

His involvement in politics included chairing the Israeli Central Elections Committee in 1965, where he notably disqualified a "subversive" list from running for the Knesset.

[7] In 1974, he became a member of the Agranat Commission, tasked with investigating intelligence and security failures leading to the Yom Kippur War.

[10] However, this drew criticism from human rights groups, who maintained that the practices authorized by the commission amounted to torture.

[3] Historian and senior fellow at the Israel Democracy Institute, Anita Shapira, commended Landau for his independence and receptivity to novel ideas, noting that he demonstrated a rare willingness to evolve and alter his perspectives.