bearisgray

I don't Press my binding in half because the pressed in crease is not where the final fold ends up.
I do baste the raw edges together to keep them even and prevent puckering because I use bias binding.

The red and orange represent the two sides of a folded piece of binding.

The orange has to make four "outside curves" while the red one has a shorter distance to travel.

Hence - letting the fabric find its own "half" works out better for me.

Drawing is exaggerated.