the problem,that I see in using the styles advocated by Sully,rather than single string style is this,the fifth string.
when I put sets of irish tunes together,I will often put three tunes that are in different keys,lets say Gmajor, Adorian,and Dmajor.,this helps to avoid monotony of sound.
If you sit in an irish session,this happens all the time,which means you have to be constantly re tuning your g string,it is just not practical,whereas single string style does not have that problem.if you are not playing in sessions ok its not a problem.
but is not the point of learning irish tunes,to go and play them at other irish sessions.