It's definitely a limitation due to the system.
They only have so many variables that can be changed, and so many that can be changed via aesthetician.

For Hrothgar, the variable that can be changed via aesthetician is the fur pattern and fur colour, with the 'Hairstyles' instead taking up the same variable slot as Au Ra horns, by being tied to the face.

Unless they change the way the aesthetician works, all Hrothgar will get is more fur patterns.