Maybe we should all be starting on single-course 12 strings?
Playing a 5-string and upwards requires a lot of advanced considerations in terms of technique. A beginner should be concentrating on gaining a solid grounding in technique. In most cases a 4 string will be much more ergonomic in terms of developing good left and right hand technique than a 5 string with wider necks, smaller string spacing and more strings to ring out and have to concentrate on muting.
Aside from that understanding the basic role of your instrument should come before you start using extended range, be it higher or lower register. It will make for a more sound foundation of your playing in general and will also make for more effective use of an extended range once you do apply it.
In regard to your reply about "needs", well it is definitely a need if you are going to play something in a higher or lower register to have those strings available to you. Those needs, in my opinion occur when you have a good solid foundation in your playing, though.