It's a very useful way of saying a tongue-twister without stumbling. Say it as if it had meaning and the repetetive syllables look after themselves. Sound is secondary to meaning.

Could I suggest that it's also true when you're playing a tune? A melody needs to be played as if the phrases have individual meaning; this goes beyond conveying a general mood into implying that each phrase is a sentence or a comment. It's very easy, particularly when playing fast sections with a lot of notes of the same length, to produce something that sounds like a list or machinery working rather than a sentence.

Valmai (Lewes)