[PeterisP]

Well that's the question - if it's "crucial to the survival", then how do ~50% of all humans survive without it?

The article does makes a point that unimportant genes have been eliminated from the Y. However, if the remaining genes and relevant proteins are beneficial (as opposed to mandatory), then it would still make sense in the [very] long run that those genes would migrate to some other chromosome, be beneficial also for female homo sapiens, and then get eliminated out of the Y as redundant there (since they'd be somewhere else for both genders already)