Quoted from cpr9999:
Don’t forget the plastic protector helps keep ball down on the ramp
It does do that, but the ball leaving the ramp is not super common once the angled brackets are installed and the plastic removed. It only happens with the super-fast ball shots. The benefits of no ugly plastic protector vs the occasional ball launch, I'll take the occasional ball launch. The game looks so much better without the extra plastic over the targets.