I have had blow-outs on steer axle tires on loaded semis, with and without power steering.

If you are paying attention and even without power steering it does not take excessive effort to control the vehical and get it to the shoulder. I once rolled over something with an old KW without power steering at highway speed and the explosion was so violent it literally blew apart the right front fiberglass fender from the hood and the truck held the lane and I simply slowed down and over.

IMO if a steer tire blowout puts the vehical off the road the responsibility lies with the driver.

Pardon me for being cynical about crash investigation conclusions.