> they include rather obscure rules as to which lane you are allowed to drive in at any moment and americans do not like to learn new rules.

Do they? I guess it probably depends on the country. Here in Sweden I'm pretty sure you can drive in whatever lane you like (unless they're explicitly labeled). But normal lane-swithching rules apply ofc and, importantly, when you enter a roundabout you have to yield to traffic in all lanes of the roundabout, not just the outermost one.