This is a very limited view of why things don't work. The main issue in my experience is whether the company values the outcome and ensures focus on optimizing for it. That can include everything from adequate staffing to comp to training to management focus. (A lot of the last one.)
You can spend a huge amount of money and still get a crappy outcome. US healthcare provides a rich field of examples.
Paying individual workers more may have some benefits, but I think the key issue is usually overworking and burnout because the incremental cost of adding a whole new employee is way higher than just pressuring workers to do more work in the same time.