If they're spending money on that, they're not spending money elsewhere. Money is a finite resource. And for sure, diminishing returns exist, but there's ALWAYS areas that are lacking in some way.

You could pay a gender studies xiggy and thirty voice actors, OR... You could get 20 more beta testers and 2 more programmers to ensure the game is 100% bug-free... OR you could get 10 more artists and 5 more physics programmers to make sure that some minor aspect looks amazing, maybe hairworks or how clothes flow with motion and with airflow. OR you could get 5 pro gamers and 5 programmers to go through the game's activity and difficulty curves one more time and make sure it is engaging and reasonable.

These are either/or, not and, options. You pay the xiggy their danegeld and dump tens of thousands on pointless voice acting and scripting, or you improve the game.

Any company that says they should pay xiggy instead of make their product better, showcases that they have no interest in making a good product. Why would I want to buy a bad product? No game dev in existance is so rich that the money spent there could not have conceivably been spent somewhere else.