Yes, you will always be asked for it and having one is the simplest route to registering a car. There are people, however, for whom a residency permit is not relevant, because they only visit for a few weeks at a time, but who still wish to have a car here. Hiring a car for three weeks twice per year probably costs more than buying a cheap second hand car. They may also have friends and relatives visit their property several times per year who could make use of the car making owning one even more economic. People in that situation have reported on this forum that it is still possible to get a car registered in their name by signing a legal declaration.