Noro Silk Garden isn't soft by any stretch of the imagination!
It's beautiful alright, but not soft. Not 'neck soft'.
If you make your scarf using Noro Silk Garden, be sure to give it a full bath before blocking, and, second step: use a softener in the final rinse (by hand of course). This will help tame the fibers and the scratchiness.
Everyone has a different tolerance for wool blends,and about what 'soft' means to them! I need warm AND soft around my neck.
Good luck! The Rav scarf is beautiful!