Its all rubbish.
Individuals aspire to sounds like other individuals from other parts of the country.
Whole bands aim to sound better than the rest.
For an example of how rubbish this suggestion is.... Take away a mans instrument (or the whole bands!) in the middle of a hymn... and tell them to keep playing.......

Does it sound english, irish scottish or welsh?
interesting phonetics eh?!
Or does it sound like a monkey's tea party?
If it does sound like a monkey's tea party can you spot what area of the country the monkey's come from???...no?
hence proof!......rubbish idea.
If anything, the conductor will foam a bands sound..... or even; generations of musical direction.