I agree with your dancer friend. It's always good to have a few new and different dances to call, but repeating old favorites is good as well.
I call regularly at the Nelson, NH dance. It happens every week on Monday night. There are probably a half dozen or more dances that are repeated all the time in Nelson. 3 or 4 of that group will be called every single Monday night. In that group are Chorus Jig (always called every Monday night, for at least 20 years), Lady Walpole's, Al's Safeway Produce, Scout House Reel, Money Musk, Petronella's Pin, Dog Branch Reel, and a few others. Callers will add other dances to try to keep things interesting, but it it very possible that the same dance will be called by the same caller with the same musicians 2, or more, weeks in a row. On a typical night there will be 3 or 4 callers, the musicians will switch 3 or 4 times, as well. But the chances are good (1 in 3, maybe) that the first or second dance of the night will be Lady Walpole's Reel with the same caller and musicians. Chorus Jig is mostly likely the 5th dance of the evening, with the same musicians each week, but the caller may vary. And there will probably be a new dance for the dancers, as well, perhaps one recently written by one of the callers. And dancers keep coming back, even with (or especially because of) the repetition! I've had more than one younger dancer tell me that Chorus Jig is their favorite dance!
Variations in the music can make the same dance moves feel much different, especially when dancing with a different partner. Rather than calling all different dances, I like to find ways to vary the energy level, from a high energy dance and music, to a slower and smoother flowing dance. Also switching from a dance that requires a lot of mental attention, to one that can be danced while almost
asleep.is an appreciated variation.
In sum, I guess i used to think that always having a new and different dance to call was the right thing to do. Now, I don't think so. Repeating some old favorites can be just as much fun.