I bought the car with 96k miles and didn't know the maintenance history of the car. Other than a fresh head job and oil change. Brake fluid is recommended to be changed every two years because it can absorb moisture, get contaminated from heat, etc. So yes, it was preventative maintenance. And if you go from black/contaminated fluid to fresh fluid, you will notice an improvement in clutch engagement and disengagement.

Speedbleeders are big in the auto cross circuit because brake fluid will loose its properties with the high temperatures of heavy braking and the fluid has to be changed between every race. While you may only need to flush the clutch fluid on your Aveo every year or so, with a Speedbleeder, you make a 30 min job with 2 people, or a 1 person job with a $200 pressure flush tool, an easy 5-min job by yourself with minimal hassle.