OP performance brings us as close as possible to how old texts would have sounded.
It enables us to hear effects lost when old texts are read in a modern way.
It avoids the modern social connotations that arise when we hear old texts read in a present-day accent.
In relation to Shakespeare and other poets...
Rhymes that don't work in modern English suddenly work.
Puns missed in modern English become clear.
New assonances and rhythms give lines a fresh impact.
OP illustrates what is meant by speaking 'trippingly upon the tongue' (Hamlet).
OP suggests new contrasts in speech style, such as between young and old, court and commoners, literate and illiterate.
OP motivates fresh possibilities of character interpretation.