Not only would it be healthier for the Dems to abandon the practice, but the nation's health would rise substantially too. Identity politics destroys American identity and turns everyone into tribal clans too paranoid of the other clans.
But the Republican Party depends on them too. They go overboard whenever they try to use the Feds to interject themselves into things like the Schaivo case or use the DEA to bust medical marijuana dispenseries. They feel the same way when Democrats do when they are trying to bust the cops for killing black guys who were acting up or when they try to get people to use the bathrooms they want.
Other people think that they are just pandering to unhinged weirdos but to them, it is part of their greater mission of making the world either a more hierarchical, robust, and stable one on one hand or a more just, peaceful, and equitable world on the other.
I am trying reiterate my point that identity politics aren't the problem for the parties, it is just that they need to have enough people as part of their clientle.