[wuliwong]

Galaxies are distributed throughout a volume of space, they don't even exist on a single plane.

Edit: here is a video which clearly shows the orientations of rotation are not aligned.

https://www.youtube.com/watch?v=14yG_YER3xc

[wuliwong]

Maybe their projections? Like all their axis of rotation are parallel?

[zaarn]

We see some galaxies from top-down so their axis of rotation cannot be parallel to any galaxy we see side-on (like the milky way)