Yes and no.
Yes, a shoulderless blade allows for easier access to the heel when honing.
No, once you master the techniques needed to hone a straight razor, you'll have all the skills you need to make it equally sharp along the entire length, regardless of whether it has a shoulder or not.
But shoulderless smiling razors are my favorite kind by far, they're just more suited to the job at hand in all aspects. I have a thing for functional simplicity.
