Exactly. Octalink which was a stepping stone to 2 piece outboard bearing cranks offered greater surface area interface for more robust crank arm/spider attachment compared to square taper. It can still be argued what is better today...Shimano's dual pinch bolt crank arm attachment which is excellent versus more common industry splined hard shoulder end bolt attachment which is solid as well. Thankfully square taper is gone. A hard shoulder is much more secure than a tapered square or spline which even changes chainline and Q-factor due to mating spline tolerance stack up.