It's essential to understand that of the 11.3M undocumented people in the US, Congress has only appointed enough resources to remove around 400k annually. Biden's guidelines systematically prioritize, by targeting only the most dangerous with the small number of funds granted to him. The fact that Justice Barrett is siding with her liberal peers on this case shows the even Conservatives believe the Texas Judge was wrong to rule against Biden.
Fewer detentions and deportations only encourage illegal aliens to cross the border in increasing numbers. The US is currently facing a major immigration crisis that COVID and the Biden administration have only exacerbated. In order to maintain a safe border, the DHS cannot focus on specific aliens over others — the crisis at the US border must be rigorously addressed.