Thank you Datan for posting this - this is the missing link for me. I'm by no means an expert of any kind, other than a rather dusty and ancient biology student, but I've read various bits and pieces (mostly on here) and it is the effect of reproductive hormone levels in milk and baby health and development that's the bit I've struggled with most.
From my understanding, the substance that is produced from male glands is essentially the same substance as that produced from female glands (and the chemicals used to induce this are the same as that used in women to increase flow) so one can see a theoretical argument in favour (biologically that is, the ethical argument is a whole other issue imo) BUT it is the hormone levels that have puzzled and concerned me.
From a very brief Google search it seems we don't know a whole lot about what hormones are in naturally occurring breastmilk in anycase, particularly reproductive hormones, which seems a bit of an oversight to say the least!
I don't have access to the following paper, but would be interested in a synopsis from anyone who might:
https://www.nature.com/articles/s41574-022-00742-y
I guess the argument for, is in the comparison with formula milk, rather than naturally occurring breastmilk. As an aside, it does also make you wonder what the reproductive hormones levels are like in cow's milk.