@Neil Blumberg, I wish we had you at all of our facilities to educate our medical staff. Sadly, convincing Hematologists and Oncologists (at least here in America) that it is better to postpone platelet transfusions than give ABO incompatible platelets is, more often than not, rejected, especially in light of the fact that many patients are having to wait because of lack of platelet inventory to begin with.
What we really need is a push for better transfusion therapy education in medical school. Along with this, continuing education for practitioners needs to become a priority. It is, however, quite difficult to get time with these practitioners. Even when we convince our laboratory medical directors to advocate for these issues, in my experience, clinicians rarely change.
All that said to say, in the "trenches," the practice will likely continue to prioritize inventory over safety.