This is not helpful. In many areas of health, but especially in public health there is increasing recognition that we need more fine-grained approaches to address pervasive equity challenges. To do so, one needs data with more resolution, not less. Aggregating information removes the ability to develop targeted counter-strategies. You might as well say that everything is biological so we should address all issues, mental, infectious diseases, aging, and so on just under the banner of biology. Especially, when it comes to mental health, men and women have different types of challenges and barriers and there is a cultural overlay that needs to recognized while trying to deliver care.
Ignoring all that really doesn't do anything helpful and can be harmful. One prominent example in a different health area, is the high mortality of black mothers in the USA, something that would not have been noticeably if one collected data while ignoring racial backgrounds.
On thing that has to be mentioned is that in the past (and to a lesser degree currently), folks have divided information along lines that were not well established and/or were colored by stereotypes. Certain types of mental health issues were disproportionately attributed to some groups, but without sufficient data to establish that this is actually the case, for example. In other words, we need more data to figure figure out where the lines really are. Which is additional work, for sure. But the benefit for figuring that out is the ability to develop new approaches to deal with challenges rather than trying (and failing) with one-size-fits all attempts.