It's probably as good a time as any to revisit this.
I don't think the project is quite large enough to really need this at this point; I think "git log" paints a fairly decent picture of who touches which code, and Wine essentially did fine without a maintainers file for the first two decades or so too. I could certainly be convinced the project would benefit from having this, but right now this feels a bit like a solution in search of a problem to me.