if you exclude accompaniment it is a stylistic restriction.
I have not slandered anybody.
"No it isn't - virtually all the finest singers in Ireland are unaccompanied and are stylishly superior to those who choose to accompany themselves". quote from Jim Carroll
The above is your opinion, it is not a fact, I think that MANY of the unaccompanied singers in the Irish singers clubs are very good and some are excellent, I also think that many accompanied singers such as Christy Moore and Andy Irvine are also very good
to say one is better than the other is like so much that you say completely and utterly stupid and ridiculous, IT IS RATHER LIKE COMPARING A LEMON TO A PEACH.
THEY ARE TWO DIFFERENT FRUITS BOTH OF WHICH ARE TASTY,BUT VERY DIFFERENT.