No matter how you slice it. A large skid wear area is proof of poor braking skills.
When braking, whether normal or an emergency stop, weight shifts forward unloading the rear wheel. In maximum effort braking the rear axle weight approaches zero, so hard wear won't happen even if the rear wheel is locked.
The above applies whenever the front brake is used at least somewhat effectively. The ONLY way to take that much tread off a tire is to ignore the front brake and lock the rear wheel while keeping yourself firmly on the saddle.
FWIW for those curious about whether a weaker rear brake would help, the answer is no. During braking, as the rear axle load approaches zero, so does the lever force needed to lock the rear wheel. That means that any meaningful effort to prevent rear wheel skids would render the brake totally ineffective otherwise.
The key to safe stopping is a well conditioned biofeedback loop. It's something developed with good training and experience.
Good engineering demands that brakes are capable of delivering more wheel stopping power than needed to stop a bike within the minimum theoretical distance.
Last edited by FBinNY; 10-18-22 at 03:16 PM.