There is nothing in there that actually indicates a form of desirable hard priority rather just saying “if you add the shield to your HP it may not be enough” which is the same as applying a mitigation. If you can survive by a mitigation or by a shield why would you use the shield mitigation first. If you need both the. There is no priority system other than just making sure both are present during the application process. And when I said true eHP I meant thrill, nebula and protraction, as in neither shields nor mitigation

So overall if you can use either why prioritise mitigation, if you need both then it’s not a priority system, that’s the question I’m asking because to me it seems like there is no real reason for your “priority” system