It is an open debate right now, but my impression (as a patient, not a practitioner) is that the consensus for stage 4 castrate-sensitive prostate cancer is still to start with radiation if there are few-enough metastases that you can target each one ("oligometastatic"), or perhaps consider chemo if there are too many. Either of those will be combined with ADT and probably some kind of ARSI for a triple attack. There are many more treatments to fall back on later, if the cancer wakes up again.