You can make a wrapper type that abstracts the offset lookup logic with a safe interface. If it's a transparent struct then rust will compile it away into nothing but you still get the abstraction in your code.

You really don't notice it while you're using a folding phone.

someone said "tablet". When I use a tablet I personally don't just notice it, I literally can't stand any uneven surface under stylus or uneven reflections.

So the unfolded state of the folded phone is not a "tablet" to me. Maybe a tablet with a glaring defect... definitely not a tablet I could use as an actual tablet.

I can't tell if you've actually tried a finding phone or not, but that would help understand and place your comments better.

I have, I have a friend with a folding phone