NSEU, don’t believe all that you hear. In most autobrake systems, the level of RTO deceleration is slightly higher than the Max landing selection.
RTO autobrake is designed for safety, not comfort; the deceleration will not generate the emotive descriptions or injuries as you imagine.
An RTO system requires some trigger function for arming (e.g. TO power and speed) in order to enable a takeoff and reduce unwarranted operation.
An RTO below 85 kts may not require full braking, but above this value it’s safer to provide the best stopping performance than rely on human assessment and judgement.