Actually, I can see this.
As others suggested, it is probably a matter of the couple's prior poor experiences with dances in Beckets. That said, there are two fairly common tendencies in Becket formation choreography which are somewhat aggravating and another which absolutely drives me up a wall. Other callers and dancers don't seem to mind so much, but were it possible I would completely avoid the dances which have the last one.
1. The first tendency has to do with diagonal figures, even though I like them myself. They are often scrunched and uncomfortable, particularly right and left throughs; people run into each other. Add to this the slight disorientation for someone not used to diagonal figures, and it can be unpleasant. In a nice open hall, they're perfectly fine. Not a problem so much with the formation as with the fact that everyone is in the middle all at once and it's confusing.
2. The second is what I like to call the "DeBecketize Manuever." How many beckets start with, "Circle left 3/4 (and usually swing your neighbor" and end with "Partner swing on the side!" (answer: TOO MANY) If all you are going to do with the first move is take the dance out of Becket, it seems like a cheap trick done just to make the dance "different." Again, not an inherent problem of the formation, just a problem of choreographic selection.
3. The third choreographic tendency is often tied to dances which feature swings at the end of the dance: partial or non progression. This problem, unlike the others, is actually made possible because of the formation: such a difficulty isn't possible in a regular duple minor, and it drives me absolutely NUTS. I have experienced a number of dances in which the caller instructs the dancers to "fudge" or "maneuver" or "sludge" or some such to make the dance work. The contra doesn't actually progress the couples down the line, but leaves them 1/2 progressed or non-progressed--usually swinging partners on the outside, but not always. Sliding up the outside from a circle is one thing; swinging on the outside and fudging down the hall is another.
The annoyance of a non-progression can be mitigated if the caller teaches it well (end facing across, look left and...), but to me the partial progression problem always jars and simply seems to be excessively lazy choreography.
Beak