Discussions seem to end up in arguments because people insist on comparing apples with pears.
From an academic point of view you would want to preserve the songs in as original form as possible. ( not always the case with some of the collectors though.)
When it comes to performers they are not bound by the same academic conventions and many will alter songs in a variety of ways to meet their own needs.
The initial comment seemed to be from the perspective of an audience member wondering why verses were repeated. The only way to be certain is to ask the performer. If it is someone known to you it might even be possible to suggest that it detracts rather than adds to the song if that is how you feel.
A search of the web looking for alternative versions of songs may even be able to ascertain whether repeats have crept in and who/when why it started. I have neither the inclination nor the time ( got a gig on Saturday to practice for) to pursue this option.
John