Gonna take a stab at it, but to be clear none of this is judgment on @Hache’s position. More just thoughts I’ve had as a white guy who writes things, and, via my educational choices, is more or less locking myself into a life of doing so professionally.
First, it’s an individual solution to a systemic problem. If the issue is opportunities not being offered to people of color in these spaces, individual white people abnegating won’t solve that. It probably just amplifies the voices of white people who are less aware and less likely to use their positions to elevate other perspectives and ideas.
Second, kind of off of that, the kinds of people who truly have nothing interesting to say are never going to come to that conclusion. So it strikes me as almost self-defeating in that way.
Third, writing — especially blogging — is not a zero sum game. Someone reading a piece by one person and being intrigued by that perspective might then seek out more. That may not hold up in certain professional contexts (like freelancing for major outlets, where there’s limited funding), but I think it’s broadly true of how people interact with writing and criticism.
Fourth, much more broadly, that logic itself kinda treats white people as a monolith without room for things like class, neurodivergence, or other forms of identity that might also be underrepresented in certain spaces.
In the end I don’t really know, but that’s where a couple of years of thinking about this has brought me. Might be a bit wrong. Might be very wrong. In the end, people should make decisions that feel right to them.