This happened to the industry worldwide. As studios became way bigger and jobs became way more specific, nobody is really allowed to do anything outside of their field. Back then, companies were small and everyone had a hand at making the game. People also wore many hats so they would get experience on making different parts of the game from start to finish.

Now? In AAA companies you work some super specific field like “junior gameplay combat designer” and you won’t have the opportunity to work on anything else and you’re in a company with 500 people that all have different opinions so anything you suggest will be ignored.