very intersting.
I used to play,with a fiddler,who had never moved from his native village In county cork,he had a very oomphy style,and although he used decorations rolls[he never used trebles],the lack of trebling was fairly common in the south west, he could have been [until you listened carefully] mistaken for Walter Bulwer.
his style despite the use of rolls was very rhythmic ,and had much in commone with Walter Bulwer,but then unlike many present day Irish session players he regularly played for crossroad dances.
one day he played Dashing away with the smoothing iron.;intrigued I asked him how he knew that tune[english folksong]he learned it[aurally] by hanging around outside a visiting holiday makers house.
he also learned a few Jimmy Shand tunes from the wireless.
There are a number of things that have caused a divergence stylistically in the 20 century ,and caused Irish music to sound less like English or Scottish,CCE is the main culprit,since 1951,their system of competitions and highmarking for ornamentation have produced a homogenised hybrid,that has consciously changed many regional irish styles,some of which were closer to English styles.