Because the design spec called for performance, and they designed a performance pad (for an OEM pad). After performance, other design criteria ranked lower.

I suspect that manufacturers get more warranty claims for squealing brakes than they do for dust (lots vs none) so it makes sense for them to use a pad that is very unlikely to ever squeal.

"squealing" in disc brakes is caused by the pad vibrating against the caliper. This vibration causes a high pitched sound which to the human ear sounds like a squeal... It is actually really easily fixed by removing the pads and applying a thin layer of grease on the BACK of the pad and reinstalling them. This will eliminate the vibration against the caliper and hence remedy the squeal...

Proceed with caution. See my post in your thread on this fix.