It is, but the UX trying to read a A4/letter sized PDF document on a phone is absolutely horrible.
I don't know much about steel coils, and I'm hoping that something that fits in your back seat isn't as dangerous as those featured in YouTube videos, but the idea that the primary concern is just strapping the thing down is kinda funny
https://www.youtube.com/watch?v=RC6pn8n7MeY
https://www.youtube.com/shorts/kDGfk-dOjq8
https://www.youtube.com/results?search_query=steel+coil+unwi...
So no, that's not the same type of complaint
You can make a phone-sized PDF and it'll be just fine.
it's not the file format.
It's pretty cool how PDFs don't typically load resources from an external website or CDN. They are self-contained, and thus demonstrably portable.
Gross analogy: Have you ever been to a multi-day music festival? A port-o-potty in the dark is disgusting, but still somewhat useable compared the alternative of going to the bathroom in public. PDF artifacts are in the same ballpark.