Setting aside the fact that it's no fun waiting around when you accidentally cat a gigabyte log file to stdout, a more efficient terminal has two main advantage

Setting aside the fact that it's no fun waiting around when you accidentally cat a gigabyte log file to stdout, a more efficient terminal has two main advantages: it runs better on low-end hardware, and it uses less power to do the same job. If you have a fast computer and don't care about battery life, there's no real reason to switch.