2 main reasons:
1) In Europe, the average consumer has different laundry habits. Here in the USA we dry everything in the dryer, not to mention people that use the dryer for pseudo dry cleaning (Dryel) and also those that use the dryer to refresh clothes. The dryers are also bigger (consequently more powerful or longer drying times) While in Europe most people dry smaller loads or they just finish drying. dryers are usually smaller and less powerful or used much less than American ones.
2) I'd never use a vinyl hose for a gas dryer because, eventually, the exhaust air can be MUCH hotter and the vinyl hose as a much lower tolerance to lint buildup, which means (if lucky) hearing that female voice saying "May I have your attention please. A fire alarm has been reported, please evacuate the building immediately".