I can't speak for the FDNY, and I do not want to defend shifting standards in general, but for the military general purpose forces (i.e. non "Special Forces") the PT test is not designed to produce a match to some absolute standard. For example, the FDNY has a portion of their test that is designed to test a candidate's ability to drag an average body weight a certain distance - that is a very specific test made to replicate a specific job task.
In contrast, the military PT test is designed to screen for a basic level or muscular strength and aerobic fitness - it isn't to screen for a particular military task, but just to see if the candidate is fit - essentially screening for at least upper 50% (IIRC) fitness in each age group and gender. Once in the military there are many task specific tests (march times with rucks, etc.) and on those some may have been adjusted for females if there was an obvious disparity. But in all honesty, many of the task specific tests were measured in an arbitrary manner, so changing them arbitrarily is hard to condemn.
So, unless there is not just a measure but a specific, verifiable reason for that measure, one shouldn't be too eager to jump to conclusions about suitability being related to test results. Where there is a solid verifiable link then the standard should be enforced because there would logically lead to some type of degradation in performance.
In contrast, the military PT test is designed to screen for a basic level or muscular strength and aerobic fitness - it isn't to screen for a particular military task, but just to see if the candidate is fit - essentially screening for at least upper 50% (IIRC) fitness in each age group and gender. Once in the military there are many task specific tests (march times with rucks, etc.) and on those some may have been adjusted for females if there was an obvious disparity. But in all honesty, many of the task specific tests were measured in an arbitrary manner, so changing them arbitrarily is hard to condemn.
So, unless there is not just a measure but a specific, verifiable reason for that measure, one shouldn't be too eager to jump to conclusions about suitability being related to test results. Where there is a solid verifiable link then the standard should be enforced because there would logically lead to some type of degradation in performance.