No your not missing something. In the base levels of OrCAD and Allegro the Silkscreen checks are limited to text and lines overlapping pins and vias. For more advanced checks you would need to look at an Allegro Venture license which does look at many more objects including text overlapping. There is a free skill app called autosilk utils which was written by Dave Elder and does cover what you want for free. Have a look at the PCB Skill forum and you should be able to find and download it from there.
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