I see a lot of furious arguing and talking points about domains as "should be separate" but no real answers as to what harm it would prevent or even precedents

I see a lot of furious arguing and talking points about domains as "should be separate" but no real answers as to what harm it would prevent or even precedents of it ever working "the way it should". It seems more like a religious dogma at this point than anything as instead of answers or logic you just get increasingly furious repeated assertions.