I keep reading threads on here about folk who are moaning about rubbish chain line but have a geared set up. I'm sorry but I just don't understand 7 to 10 gears on the back, 1, 2 or 3 on the front. If your frame is straight and you are using the middle position at the front for a 1x set up how can it be rubbish?
My only conclusion is people have bent frames, derailleur or hangers. Or simply have no idea what they are talking about.