"position & hold" going away

The question remains, if neither pilot aboard the landing 737 could see the
Fairchild 227 on the runway, why should we believe the crew of the Fairchild
227 could have seen the incoming 737 if they had been cocked some thirty
degrees or so from the runway centerline?

The accident happened shortly before sunset on runway 24. So the
pilots on the 737 would have been looking nearly into the sun whereas a
pilot looking back would be seeing a landing light in a darkening sky.

But regardless of the details of this particular incident, why not have
the redundancy of having both aircraft crews in a position where they
could observe and possibly avert an imminent collision?