Don't know if I agree on the height issues... every machine has ladders, they give you a tower fairly early on, and you can always walk on conveyors

As for debugging, I've found that planning a build on paper, keeping in mind production ratios, eliminates the need to experiment and debug, and then building simply becomes figuring out how to route conveyors

I've never had issues troubleshooting by getting to a high place and looking at the big picture, but to be honest since I started planning my builds on paper it barely even comes up