The reason they take these cases so often is because affirmative action must be narrowly tailored and affirmative action programs are often found to be Unconstitutional.
Also, affirmative action as a whole, as acknowledged by the Supreme Court, is a temporary measure to level the playing field of prior systemic racism. So even in the instances a program is currently a constitutional even that is for a temporary period of time.
People often complain about the nature of it, but generally don’t have any solutions to address the realities of historic discrimination codified in law, at best people suggest to ignore it a do nothing be happy those old laws have been over turned and move on, the problem there is typically the people that suggest doing nothing to right the wrongs of the past benefit from damage of historical systematic racism and discrimination.