Probably not technically a bug, but vertical wires still look largely the same. Horizontal lines, and diagonal lines are way more visible, which is great.

It's definitely a frustration; there does not seem to be any way to change how the lines are rendered. It must be an internal thing. I was considering raising a bug with the Factorio team, but not sure how they respond to bugs specifically around API changes.

I think it might be worth a try. At worst, you could get ignored, or they might explain why they can't do anything, at best they might change something so it suits your needs.