It is often stated that a human birth is very precious,primarily, but not solely,because the balance between pleasure and suffering is optimum to enable one to see into dukkha, its causes, and, with greater difficulty, into its results as also those of sukkha.
However,living as a human during a Buddha sasana is rare. The human bhavas one lives through outside of a Buddha sasana, without ‘the Dhamma in circulation’, or without any possibility of access to it, even during a Buddha sasana, does away with the value of a human bhava. That will be the case with most, even now. One is left to one’s own devices, as high as those may be, contemplating for instance, the implications of eternity, infinity, even perhaps to getting the fleeting idea from the material world all around as analogy,that all phenomena, even mental ones ,must have causes as well as results. But there is no way one could discover by oneself all that a Buddha reveals out of his once-in-a (or so many)- kappas Purity of Mind: the 31 realms, the 4 Noble truths, Tilakkhana,PS ,the intricate details in Abhidhamma and so on.
Therefore,on the practical side a human bhava acquires all the more value when one happens to be living through it during a Buddha sasana
This is to emphasize once more, if there were any need for it, the supreme importance of striving when the conditions happen to be just right.
Metta to all