I use black by default across all our projects now and I'm all for it, but it does seem kind of ironic that whilst the main selling point of black is to take away these kind of code style discussions there seem to have been way more of them since black came to popularity :)
I do expect it'll just be fine once everyone's got used to it. Maybe its a consequence of a tool like this coming into existence on a language with such a long history already.
I don't think it increased the amount of discussions, just centralised it. Before it would happen between developers in the same repo, now it's all in the same place.
I think that a good thing. Formatting discussions are important (arguably), but it should be decoupled from a specific project.
I do expect it'll just be fine once everyone's got used to it. Maybe its a consequence of a tool like this coming into existence on a language with such a long history already.